Related Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
ASTM A1082/A1082M Grade S31100 | 304L Austenitic Stainless Steel
Low-carbon austenitic steel with superior weldability and corrosion resistance
Grade S31100 (UNS S31100) is the low-carbon version of 304 stainless steel, designated as ASTM A1082/A1082M F304L, featuring a maximum carbon content of 0.03% to minimize carbide precipitation during welding and high-temperature service. This austenitic grade contains 18% chromium and 8% nickel, providing excellent corrosion resistance in mild atmospheric, aqueous, and chemical environments. S31100 is widely used in food processing equipment, pharmaceutical piping, chemical tanks, architectural applications, and general industrial fabrications where welding is required without post-weld heat treatment. The low carbon content ensures optimal intergranular corrosion resistance in heat-affected zones, making it ideal for fabricated assemblies, pressure vessels, and piping systems.
ASTM A1082/A1082M Grade S31100 Chemical RequirementsA
| Grades | UNS Designation | Type | C | Mn | P | S | Si | Cr | Ni | Mo | N | Other ElementsB |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A1082/A1082M Austenitic Stainless Steel Grades | S31100 | . . . | 0.06 | 1.00 | 0.045 | 0.030 | 1.00 | 25.0-27.0 | 6.0-7.0 | . . . | . . . | Ti 0.25 |
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ASTM A1082/A1082M Grade S31100 Mechanical Properties
| UNS Designation | Solution Temperature, °F [°C] (B, C) | Tensile Strength, min, ksi [MPa] | Yield Strength, 0.2% offset, min, ksi [MPa] | Elongation in 4D, min, % | Rockwell HRC, max | Brinell max (D) |
|---|---|---|---|---|---|---|
| S31100 | 1900 [1040] | 90 [620] | 65 [450] | 20 | 30 | 290 |
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ASTM A1082/A1082M Markings
| UNS Designation | Grade Symbol |
|---|---|
| S31100 | TB 31100 |
Frequently Asked Questions
What is 304L Stainless (S31100)?
304L Stainless (S31100) is a stainless steel grade covered under ASTM A1082/A1082M for high-strength bolting in special-purpose applications such as pressure vessels. UNS designation S31100. Available as bolts, studs, screws and nuts manufactured by TorqBolt for global oil/gas/nuclear/power/marine sectors.
What are the mechanical properties of 304L Stainless (S31100) per ASTM A1082?
Mechanical property requirements for S31100 are defined in ASTM A1082 Table 2 (PH grade solution treatment) or Table 4 (duplex annealed condition). Properties vary by treatment condition - refer to the bolting specification for the H-condition (PH) or annealed yield/tensile/elongation/hardness requirements applicable to your order.
Is 304L Stainless (S31100) suitable for sour service (NACE MR0175)?
Refer to NACE MR0175 / ISO 15156 Tables A.16-A.19. Most A1082 duplex grades are permitted at ≤28 HRC; PH grades require condition-specific qualification (typically H1150 for 17-4 PH at 28 HRC). TorqBolt supplies sour-service certified product on request with full PMI + hardness traceability.
What ASME / ISO dimensional standards can 304L Stainless (S31100) be supplied to?
This grade is available across the full ASME and ISO bolting dimensional standards covered on this site - ASME B18.2.1 (hex bolts, hex cap screws, lag screws), B18.2.2 (hex nuts, square nuts, lock nuts), B18.3 (socket head cap screws), B18.31.2 (clamping studs), B16.5 (flange stud bolts), ISO 4032 / 4033 / 4035 (metric nuts), and metric B18.2.3.xM / B18.2.4.xM series.
References & Standards
- ASTM A1082 / A1082M - Standard Specification for High-Strength Precipitation-Hardening and Duplex Stainless Steel Bolting for Special-Purpose Applications (current edition 2016, active)
- ASTM A962 / A962M - General Requirements for Special-Purpose Bolting Materials
- ASTM A370 - Mechanical Testing of Steel Products
- NACE MR0175 / ISO 15156 - Sour-service hardness limits for petroleum & natural gas industries
- ASME B18 series - Dimensional standards for bolts, screws, nuts, studs
- ISO 4032 / 4033 / 4035 - Metric hexagon nut dimensional standards
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