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Stainless Steel Guide — 2026
Stainless Steel Grades for Industrial Valves — Complete 2026 Guide | KELOR
The definitive engineering reference for stainless steel grades used in industrial valves: SS304/CF8, SS316/CF8M, SS304L/CF3, SS316L/CF3M, duplex CD4MCu, and super duplex. Complete chemical composition, mechanical properties, PREN corrosion resistance, Indian equivalents (IS 6911), temperature ratings, and grade selection guidance for B2B procurement across India.
8+Grades Covered
2Forms: Cast + Wrought
PRENCorrosion Index
6+Industries Served
📦 Stainless Steel Valves — Sourcing Overview
KELOR (Krishna Industries) sources a comprehensive range of stainless steel valves from verified manufacturers for bulk B2B supply across India and international markets. Our stainless steel range covers all major grades used in industrial valve applications.
- Austenitic Cast Grades (ASTM A351): CF8 (SS304), CF8M (SS316), CF3 (SS304L), CF3M (SS316L)
- Duplex Cast Grades (ASTM A995): CD4MCu, CD4MCuN, CE8MN, CD3MN, CD3MWCuN, CE3MN
- Wrought Grades (ASTM A182): F304, F316, F304L, F316L
- Valve Types: Gate, Globe, Ball, Butterfly, Check, Control, Relief
- Size Range: 15mm (1/2″) to 1200mm (48″) and above
- Pressure Class: Class 150, 300, 600, 900, 1500, 2500
MOQ: Negotiable for bulk & project orders | GST: Registered | Dispatch: Pan India & Export | Mill Test Report 3.1 can be provided on request
What Makes Stainless Steel Different for Valve Applications?
Stainless steel is an iron-based alloy containing a minimum of 10.5% chromium, which forms a self-healing oxide layer (passive film) on the surface that provides corrosion resistance. For industrial valve applications, this corrosion resistance is the primary reason stainless steel is specified over carbon steel (WCB/A105) — especially in environments involving chlorides, acids, pharmaceuticals, food processing, and offshore installations. In the Indian industrial context, stainless steel valves are essential across refineries, petrochemical plants, pharmaceutical facilities, water treatment plants, and coastal/offshore installations where the saline atmosphere of the Arabian Sea and Bay of Bengal makes carbon steel inadequate.
🔧
Corrosion Resistance
Chromium oxide passive film provides self-healing protection against uniform corrosion, pitting, and crevice corrosion in a wide range of industrial environments.
❄
Cryogenic Capability
Austenitic stainless steels (CF3, CF3M) maintain excellent ductility and toughness at temperatures as low as -268°C — essential for LNG and industrial gas plants.
🔥
High-Temperature Service
CF8 and CF8M retain strength up to 870°C continuous service — suitable for high-temperature steam, thermal fluid, and process heating applications.
💧
Hygienic Properties
Smooth, non-porous surface finish makes stainless steel the standard choice for food, beverage, and pharmaceutical valve applications per FDA and EHEDG guidelines.
♻
Weldability
All austenitic grades are readily weldable using standard procedures (GTAW, GMAW, SMAW). L-grades eliminate intergranular corrosion risk without post-weld heat treatment.
💰
Lifecycle Value
Despite higher initial cost versus carbon steel, stainless steel valves deliver significantly longer service life in corrosive environments — reducing replacement and maintenance costs.
ASTM A351 is the primary international standard for austenitic stainless steel castings used in pressure-containing valve parts. The four most common grades for industrial valve bodies are CF8 (SS304 cast equivalent), CF8M (SS316 cast equivalent), CF3 (SS304L cast equivalent), and CF3M (SS316L cast equivalent). These grades account for over 95% of all stainless steel valve body castings produced worldwide, and are the standard specification for Indian EPC projects, refinery maintenance, and pharmaceutical plant construction.
CF8 = SS304 Cast
CF8 (UNS J92600)
- Cr: 18.0–21.0% | Ni: 8.0–11.0%
- C: 0.08% max | Mo: 0.50% max
- UTS: 485 MPa | YS: 205 MPa
- Elongation: 35%
- Temp: -196°C to +870°C
- Most cost-effective SS valve grade
CF8M = SS316 Cast
CF8M (UNS J92900)
- Cr: 18.0–21.0% | Ni: 9.0–12.0%
- C: 0.08% max | Mo: 2.0–3.0%
- UTS: 485 MPa | YS: 205 MPa
- Elongation: 30%
- Temp: -196°C to +870°C
- +2-3% Mo = superior corrosion resistance
CF3 = SS304L Cast
CF3 (UNS J92500)
- Cr: 17.0–21.0% | Ni: 8.0–12.0%
- C: 0.03% max | Mo: 0.50% max
- UTS: 450 MPa | YS: 175 MPa
- Elongation: 30%
- Temp: -268°C to +425°C
- No PWHT needed after welding
CF3M = SS316L Cast
CF3M (UNS J92800)
- Cr: 17.0–21.0% | Ni: 9.0–13.0%
- C: 0.03% max | Mo: 2.0–3.0%
- UTS: 450 MPa | YS: 175 MPa
- Elongation: 30%
- Temp: -268°C to +425°C
- Best for cryogenic + corrosive service
Chemical Composition — ASTM A351 Cast Grades (wt%, max unless range noted)
| Element | CF8 (J92600) | CF8M (J92900) | CF3 (J92500) | CF3M (J92800) |
|---|---|---|---|---|
| Carbon (C) | 0.08 max | 0.08 max | 0.03 max | 0.03 max |
| Manganese (Mn) | 1.50 max | 1.50 max | 1.50 max | 1.50 max |
| Phosphorus (P) | 0.040 max | 0.040 max | 0.040 max | 0.040 max |
| Sulfur (S) | 0.040 max | 0.040 max | 0.040 max | 0.040 max |
| Silicon (Si) | 2.00 max | 2.00 max | 2.00 max | 2.00 max |
| Chromium (Cr) | 18.0–21.0 | 18.0–21.0 | 17.0–21.0 | 17.0–21.0 |
| Nickel (Ni) | 8.0–11.0 | 9.0–12.0 | 8.0–12.0 | 9.0–13.0 |
| Molybdenum (Mo) | 0.50 max | 2.0–3.0 | 0.50 max | 2.0–3.0 |
| Nitrogen (N) | — | 0.10 max | — | 0.10 max |
Mechanical Properties — ASTM A351 Cast Grades (Minimum, after solution annealing)
| Property | CF8 | CF8M | CF3 | CF3M |
|---|---|---|---|---|
| Tensile Strength (MPa) | 485 | 485 | 450 | 450 |
| Tensile Strength (ksi) | 70 | 70 | 65 | 65 |
| Yield Strength (MPa) | 205 | 205 | 175 | 175 |
| Yield Strength (ksi) | 30 | 30 | 25 | 25 |
| Elongation (%) | 35 | 30 | 30 | 30 |
| Hardness (Brinell) | 140–200 HB | 140–200 HB | — | — |
💡 Key Difference: The only chemical difference between standard grades (CF8/CF8M) and L-grades (CF3/CF3M) is the carbon content — 0.08% max vs 0.03% max. This lower carbon content in L-grades prevents chromium carbide (Cr23C6) precipitation during welding, eliminating the risk of intergranular (sensitization) corrosion in the heat-affected zone without requiring post-weld heat treatment.
SS304 (CF8) vs SS316 (CF8M) — When to Use Which?
This is the single most common material selection decision in Indian valve procurement. The presence or absence of 2-3% molybdenum in SS316/CF8M makes a dramatic difference in corrosion resistance, especially against chlorides and acids — but it also adds approximately 15-20% to the material cost. For non-corrosive and mildly corrosive environments, SS304/CF8 is the most cost-effective choice. For chloride-containing environments (common in Indian coastal refineries, desalination plants, and pharmaceutical facilities), SS316/CF8M is the minimum recommended grade.
| Feature | SS304 / CF8 | SS316 / CF8M |
|---|---|---|
| Molybdenum Content | None (0.50% max) | 2.0–3.0% |
| Relative Cost | Baseline (lowest cost SS) | ~15–20% premium over 304 |
| General Corrosion | Good | Excellent |
| Pitting Resistance (PREN) | ~19 | ~25.3 |
| Chloride Resistance | Poor to Moderate (<50 ppm) | Good (50–1000 ppm) |
| Marine / Coastal | Not recommended | Acceptable (topside only) |
| Food & Beverage | Excellent (most common choice) | Excellent (often overkill) |
| Pharmaceutical | Common | Preferred (GMP standard) |
| Sulfuric Acid (dilute) | Up to 5% at RT | Up to 15% at RT |
| H2S Sour Service | Limited | Better but limited |
| Weldability | Good (PWHT may be needed) | Good (PWHT may be needed) |
⚠ Indian Coastal Warning: For Indian coastal and offshore installations where seawater chloride levels reach 19,000–35,000 ppm (Arabian Sea, Bay of Bengal), neither SS304/CF8 nor SS316/CF8M is adequate for continuous seawater exposure. For such applications, duplex grades (CD4MCuN or super duplex) are required. SS316/CF8M is acceptable for topside/non-immersion coastal service only.
The Pitting Resistance Equivalent Number (PREN) is the engineering industry’s standard method for comparing the pitting corrosion resistance of different stainless steel grades. It is calculated using the formula: PREN = %Cr + (3.3 × %Mo) + (16 × %N). A higher PREN value indicates better resistance to pitting corrosion in chloride-containing environments — which is the single most common cause of stainless steel valve failure in Indian industrial installations, particularly in coastal refineries, desalination plants, and offshore platforms.
| Grade | Cr (mid %) | Mo (mid %) | N (mid %) | PREN | Corrosion Level |
|---|---|---|---|---|---|
| CF8 / 304 | 19.0 | 0 | 0 | ~19 | Moderate |
| CF3 / 304L | 19.0 | 0 | 0 | ~19 | Moderate |
| CF8M / 316 | 17.0 | 2.5 | 0 | ~25.3 | Good |
| CF3M / 316L | 17.0 | 2.5 | 0 | ~25.3 | Good |
| CE8MN (Lean Duplex) | 22.25 | 0.45 | 0.125 | ~26 | Good |
| CD4MCu (Duplex) | 25.5 | 2.0 | 0 | ~32.1 | Very Good |
| CD3MN / 2205 Cast | 22.25 | 3.0 | 0.15 | ~34.8 | Very Good |
| CD4MCuN (1B) | 25.5 | 2.0 | 0.175 | ~36.1 | Excellent |
| Super Duplex (5A/6A) | 25.0 | 3.5 | 0.275 | ~40.7 | Superb |
🎯 PREN Classification Guide
- PREN < 18: Marginal — mild environments only
- PREN 18–24: Moderate — fresh water, mild organics, atmospheric (SS304 range)
- PREN 24–30: Good — moderate chlorides (50–500 ppm), mild acids (SS316 range)
- PREN 30–36: Very Good — seawater (intermittent), higher chlorides (Standard Duplex range)
- PREN 36–40: Excellent — seawater (continuous), aggressive chlorides (Super Duplex range)
- PREN > 40: Superb — severe chloride, hot seawater, high H2S (Special Super Duplex)
Chloride Pitting Resistance by Grade
| Grade | Max Chloride (approx. ppm) | Indian Suitability |
|---|---|---|
| CF8 / 304 | < 50 ppm | Indoor, non-marine, non-chloride |
| CF8M / 316 | 50–1,000 ppm | Mild chloride, topside coastal |
| CD4MCu | Up to ~10,000 ppm | Marine splash zone |
| CD4MCuN / Super Duplex | 15,000–35,000 ppm | Full seawater, offshore subsea |
| Super Duplex (5A) | > 35,000 ppm | Hot seawater, desalination plants |
Duplex Stainless Steel Grades — ASTM A995
Duplex stainless steels have a two-phase microstructure (approximately 50% austenite + 50% ferrite) that delivers significantly higher mechanical strength and superior corrosion resistance compared to standard austenitic grades. For Indian offshore platforms, coastal refineries (MRPL, CPCL), and desalination plants, duplex grades are increasingly specified where SS316/CF8M is insufficient. The most common duplex cast grades for valve bodies are covered by ASTM A995 (formerly referenced in ASTM A351). Important note: duplex grades are limited to approximately 260–300°C maximum service temperature due to embrittlement concerns at higher temperatures.
Standard Duplex
CD4MCu (UNS J93370)
- Cr: 24.5–26.5% | Ni: 4.75–6.0%
- Mo: 1.75–2.25% | Cu: 2.75–3.25%
- UTS: 690 MPa | YS: 485 MPa
- PREN: ~32.1
- Marine splash zone service
Enhanced Duplex
CD4MCuN (UNS J93372)
- Cr: 24.5–26.5% | Ni: 4.75–6.0%
- Mo: 1.70–2.30% | N: 0.10–0.25%
- UTS: 690 MPa | YS: 485 MPa
- PREN: ~36.1
- Recommended for Indian offshore
Super Duplex
CD3MWCuN / CE3MN
- Cr: 24.0–26.0% | Ni: 6.0–8.5%
- Mo: 3.0–4.0% | N: 0.20–0.35%
- UTS: 690 MPa | YS: 485 MPa
- PREN: ~40.7
- Best choice for subsea seawater
India does not have a direct BIS standard that duplicates ASTM A351 cast grade nomenclature (CF8, CF8M, etc.). Indian valve foundries and EPC contractors typically reference ASTM standards directly. However, BIS IS 6911:2017 covers wrought grades, and IS 6603:2001 covers bars and flats. For valve body castings, the Indian industry overwhelmingly uses ASTM A351 directly — this is accepted by Indian Boiler Regulations (IBR) and IS 2825 (pressure vessel code). Below is the cross-reference between ASTM and IS 6911 designations for wrought products, and the equivalent cast grade mappings.
| ASTM Cast (A351) | UNS | ASTM Wrought (A182) | IS 6911 Grade | EN Equivalent |
|---|---|---|---|---|
| CF8 | J92600 | F304 | Grade 12 (Cr19Ni9) | 1.4301 |
| CF8M | J92900 | F316 | Grade 14 (Cr17Ni12Mo2) | 1.4401 |
| CF3 | J92500 | F304L | Grade 12L (Cr19Ni9L) | 1.4307 |
| CF3M | J92800 | F316L | Grade 14L (Cr17Ni12Mo2L) | 1.4404 |
| CD4MCu | J93370 | F53 | No IS equivalent | 1.4507 |
| CD4MCuN | J93372 | F55 | No IS equivalent | 1.4501 |
📖 Practical Note for Indian Buyers: For government/PSU procurement (ONGC, IOCL, NTPC, GAIL, BHEL), ASTM A351 cast grades are fully accepted. BIS IS 2612 (stainless steel castings) is largely obsolete. Always verify the specific grade designation (CF8, CF8M, etc.) on the P&ID and Bill of Materials — not just “stainless steel” — to avoid procurement errors.
Temperature Ratings — All Grades
Understanding temperature limits is critical for correct grade selection. Austenitic grades (CF8, CF8M, CF3, CF3M) offer excellent high-temperature and cryogenic capability, while duplex grades are limited to approximately 260–300°C due to phase embrittlement at elevated temperatures. The actual working pressure at any given temperature must be verified against the component’s pressure-temperature rating per ASME B16.34, not just the material’s temperature range alone.
| Grade | Min Temp (°C) | Max Continuous (°C) | Key Notes |
|---|---|---|---|
| CF8 / 304 | -196 | 870 | Above 425°C: carbide precipitation risk |
| CF8M / 316 | -196 | 870 | Above 450°C: sigma phase risk with Mo |
| CF3 / 304L | -268 | 425 | Low C limits high-temp creep strength |
| CF3M / 316L | -268 | 425 | Excellent for cryogenic + corrosive |
| CD4MCu | -100 | 260 | Duplex embrittlement above ~300°C |
| CD4MCuN | -75 | 260 | Not recommended for cryogenic |
| CE8MN (Lean Duplex) | — | 300 | Lean duplex grade |
| Super Duplex (5A/6A) | — | 300 | Duplex embrittlement above ~300°C |
⚠ ASME B16.34 Material Groups: CF8/CF8M/CF3/CF3M fall under Material Group 1.2. Duplex grades (per ASTM A995) fall under Groups 1.5 and 1.6. Always verify the correct material group when referencing ASME B16.34 pressure-temperature ratings for your specific valve class and size.
The decision between standard grades (CF8/CF8M with 0.08% max C) and L-grades (CF3/CF3M with 0.03% max C) is primarily driven by welding requirements and service temperature. L-grades eliminate the risk of intergranular corrosion (sensitization) that can occur when standard grades are heated in the 450–850°C range during welding — without requiring post-weld heat treatment. However, the lower carbon content also reduces high-temperature creep strength, limiting L-grades to 425°C maximum versus 870°C for standard grades.
✅ Use L-grades (CF3/CF3M) When:
Welded assemblies where post-weld heat treatment is not possible; corrosive service after welding (prevents sensitization); cryogenic applications below -50°C; pharmaceutical and food-grade installations where corrosion resistance is paramount; multi-pass welding on thick sections.
✅ Use Standard Grades (CF8/CF8M) When:
No welding involved or PWHT will be performed; high-temperature service above 500°C (where higher carbon provides better creep strength); cost-sensitive applications; non-welded cast valve bodies; general-purpose water, steam, and chemical service.
🔴 When L-grades are NOT suitable:
High-temperature service above 425°C (lower creep strength); applications requiring higher mechanical properties (L-grades have lower UTS and YS); when the cost premium cannot be justified for non-critical service.
Industry Applications — Grade Selection by Sector
Each Indian industrial sector has specific requirements that drive stainless steel grade selection. Below is a comprehensive guide to the most commonly specified grades for each industry, along with the reasoning behind each selection. These recommendations apply to valve body material — internal trim materials may require different grades depending on the specific service conditions.
| Industry | Recommended Grade | Why This Grade |
|---|---|---|
| Oil & Gas (Onshore) | CF8M / F316 | Good chloride and H2S resistance for refinery process streams |
| Oil & Gas (Offshore) | CD4MCuN / Super Duplex | Seawater chloride resistance (PREN 36–42) essential for subsea |
| Petrochemicals | CF8M / CF3M | Acid and chloride resistance for chemical process streams |
| Pharmaceuticals | CF3M / CF8M | Surface finish + corrosion resistance for GMP compliance |
| Food & Beverage | CF8 / 304 | Excellent hygienic properties; non-reactive with food products |
| Water Treatment (Municipal) | CF8 / 304 | Cost-effective for non-chloride treated water |
| Desalination | Super Duplex / CD4MCuN | High chloride (seawater) resistance essential |
| LNG / Cryogenic | CF3M / CF3 | Excellent impact toughness to -268°C |
| Power Generation (Thermal) | CF8 / 304 | High-temperature steam service up to 870°C |
| HVAC / Building Services | CF8 / 304 | Most cost-effective for chilled/hot water systems |
| Chemical Processing | CF8M / CF3M | Wide acid and solvent resistance |
| Pulp & Paper | CD4MCu / CF8M | Chloride-rich white water environments |
Different valve types are commonly manufactured in specific stainless steel grades depending on the application. Below is a practical reference guide for Indian procurement teams to understand which grades are typically available for each valve type.
Gate Valve
SS Gate Valve Grades
- CF8: Water, steam, general (1/2″–48″)
- CF8M: Chemical, mild acid (1/2″–48″)
- CF3/CF3M: Cryogenic LNG (1/2″–24″)
- Duplex: Seawater, offshore (2″–24″)
Globe Valve
SS Globe Valve Grades
- CF8: Steam, water throttling (1/2″–12″)
- CF8M: Acid/chemical service (1/2″–12″)
- CF3M: Cryogenic throttling (1/2″–6″)
Ball Valve
SS Ball Valve Grades
- CF8: General, water (1/4″–24″)
- CF8M: Chemical, offshore topside (1/4″–24″)
- CF3M: Cryogenic LNG (1/4″–6″)
- Duplex: Seawater (1/2″–12″)
Butterfly Valve
SS Butterfly Valve Grades
- CF8: Water, HVAC (2″–72″)
- CF8M: Chemical, desalination (2″–48″)
- Duplex: Seawater, marine (2″–48″)
Need Stainless Steel Valves for Your Project?
KELOR sources stainless steel valves in all grades — CF8, CF8M, CF3, CF3M, duplex, and super duplex — with full documentation. Contact us for project-specific quotations.
About KELOR — Stainless Steel Valve Supplier from Ahmedabad, India
KELOR (Krishna Industries) sources stainless steel valves from verified manufacturers whose products comply with ASTM A351, ASTM A182, ASTM A995, and ASME B16.34 standards — every supplier vetted for quality, dimensional accuracy, and testing compliance. We provide the required technical details, specification sheets, and documentation that EPC contractors, consultants, and plant procurement teams need to accurately specify and procure stainless steel valves for their projects.
- Business Scope: Manufacturing, procurement, supply and distribution of rubber products, industrial flanges, fasteners and industrial valves
- SS Grades: CF8, CF8M, CF3, CF3M, CD4MCu, CD4MCuN, Super Duplex — all with test certificates
- Documentation: Mill Test Report 3.1 can be provided on request; hydro test certificates per API 598
- Dispatch: Pan India & international export — project-based and bulk supply
What is the difference between SS304 and SS316 for valves?
SS316 contains 2-3% molybdenum which gives it superior pitting and crevice corrosion resistance compared to SS304. SS304 (CF8 cast) costs 15-20% less and is suitable for non-chloride environments. SS316 (CF8M cast) is preferred for chloride-containing environments, chemical processing, pharmaceutical, and offshore applications. For Indian coastal installations, SS316 is the minimum recommended grade.
What is CF8 and CF8M in valve specifications?
CF8 and CF8M are ASTM A351 cast stainless steel grades. CF8 (UNS J92600) is the cast equivalent of SS304, containing 18-21% Cr and 8-11% Ni. CF8M (UNS J92900) is the cast equivalent of SS316, with the addition of 2-3% Mo for improved corrosion resistance. These are the two most common stainless steel grades for industrial valve bodies worldwide, used in refineries, petrochemical plants, and process industries across India.
When should I use L-grade stainless steel (CF3, CF3M) for valves?
Use L-grades (CF3/CF3M with max 0.03% carbon) when the valve assembly will be welded and post-weld heat treatment is not possible, when service involves corrosive media after welding, or for cryogenic applications below -50°C. L-grades eliminate intergranular corrosion risk by preventing chromium carbide precipitation in the heat-affected zone, which is critical for pharmaceutical, food, and chemical process installations.
What is the Indian equivalent of SS304 and SS316?
The Indian standard IS 6911:2017 covers wrought grades: Grade 12 (Cr19Ni9) is equivalent to SS304, and Grade 14 (Cr17Ni12Mo2) is equivalent to SS316. For cast valve bodies (CF8, CF8M), no direct BIS equivalent exists — Indian industry uses ASTM A351 directly. IS 6603:2001 covers stainless steel bars and flats with similar compositions. ASTM A351 grades are accepted by Indian Boiler Regulations (IBR) and IS 2825.
What is PREN and why does it matter for valve grade selection?
PREN (Pitting Resistance Equivalent Number) is calculated as: PREN = %Cr + 3.3 x %Mo + 16 x %N. It predicts pitting corrosion resistance in chloride environments. SS304 has PREN ~19, SS316 has PREN ~25.3, duplex CD4MCu has PREN ~32, and super duplex has PREN 38-42. Higher PREN means better chloride resistance — critical for Indian coastal and offshore installations where seawater chlorides reach 19,000-35,000 ppm.
Can stainless steel valves be used for cryogenic service?
Yes. L-grade austenitic stainless steels (CF3, CF3M — equivalent to SS304L, SS316L cast) are excellent for cryogenic service down to -268°C (-450°F). Standard grades CF8 and CF8M are suitable to -196°C (-320°F). Duplex grades have limited cryogenic capability. For LNG terminals, LOX/LIN plants, and industrial gas applications in India, CF3M (SS316L cast) is the most common choice.
What stainless steel grade is best for Indian coastal and offshore environments?
For Indian coastal/offshore installations with seawater chloride levels of 19,000-35,000 ppm: SS304/CF8 is NOT suitable, SS316/CF8M is marginal for short-term exposure only. ASTM A995 CD4MCuN (Grade 1B) is recommended for seawater splash zone, and Super Duplex (Grade 5A/6A) is the best choice for subsea and continuous seawater exposure. These duplex grades offer PREN values of 36-42 compared to 316’s 25.3.
Does KELOR supply stainless steel valves in all grades?
KELOR sources stainless steel valves from verified manufacturers in CF8, CF8M, CF3, CF3M, duplex, and super duplex grades — covering gate valves, globe valves, ball valves, butterfly valves, check valves, and control valves. Mill Test Report 3.1 can be provided on request. Pan-India and international delivery available for bulk B2B orders.
What is the maximum temperature for SS316 (CF8M) valves?
SS316/CF8M valves are rated for continuous service up to 870°C (1600°F) per ASME B16.34. However, above 450°C, molybdenum-bearing grades face sigma phase embrittlement risk. For high-temperature steam service above 500°C, SS304/CF8 (without molybdenum) is often preferred. Duplex grades are limited to approximately 260-300°C due to embrittlement concerns.
What documents should I get with stainless steel valve orders?
Always require: (1) Mill Test Certificate 3.1 showing chemical analysis and mechanical test results, (2) Hydrostatic pressure test certificate per API 598 or ASME B16.34, (3) Material test report with heat number traceability, (4) NDT reports if RT/UT/PT was specified, (5) GST invoice with GSTIN for input tax credit. KELOR provides GST invoice with every order. Mill Test Report 3.1, hydro test certificates and NDT reports are arranged on request from verified vendors.
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KELOR Krishna Industries — Stainless Steel Valve Supplier India
Source stainless steel valves that match your project specifications — CF8, CF8M, CF3, CF3M, duplex, super duplex in all valve types with full documentation and technical support.