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 S32202 | Duplex 2202 Stainless Steel
High-strength lean duplex steel with excellent resistance to stress corrosion cracking
Grade S32202 (UNS S32202) is a lean duplex stainless steel, designated as Duplex 2202, featuring a low-nickel (2%) and low-molybdenum composition with 22% chromium and nitrogen additions to provide a high-strength, cost-effective alternative to standard austenitic grades. This lean duplex alloy delivers approximately double the yield strength of 304L and 316L with significantly superior resistance to chloride-induced stress corrosion cracking (SCC), making it ideal for storage tanks, pressure vessels, structural components, and water treatment equipment. S32202 is widely utilized in the pulp and paper industry, chemical processing, and civil engineering where mechanical durability and long-term corrosion resistance are required at stable pricing. The material combines excellent weldability and toughness, enabling efficient fabrication of large-scale industrial equipment and structural assemblies.
ASTM A1082/A1082M Grade S32202 Chemical RequirementsA
| Grades | UNS Designation | Type | C | Mn | P | S | Si | Cr | Ni | Mo | N | Other ElementsB |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A1082/A1082M Duplex (Ferritic-Austenitic) Grades | S32202 | . . . | 0.030 | 2.00 | 0.040 | 0.010 | 1.00 | 21.5-24.0 | 1.0-2.80 | 0.45 | 0.18-0.26 | . . . |
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ASTM A1082/A1082M Grade S32202 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 2" [50 mm] or 4D, min, % | Rockwell HRC, max | Brinell max (D) |
|---|---|---|---|---|---|---|
| S32202 | 1800 to 1975 [980 to 1080] | 94 [650] | 65 [450] | 30 | 30 | 290 |
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ASTM A1082/A1082M Markings
| UNS Designation | Grade Symbol |
|---|---|
| S32202 | TB 32202 |
Frequently Asked Questions
What is Duplex 2202 (S32202)?
Duplex 2202 (S32202) is a stainless steel grade covered under ASTM A1082/A1082M for high-strength bolting in special-purpose applications such as pressure vessels. UNS designation S32202. Available as bolts, studs, screws and nuts manufactured by TorqBolt for global oil/gas/nuclear/power/marine sectors.
What are the mechanical properties of Duplex 2202 (S32202) per ASTM A1082?
Mechanical property requirements for S32202 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 Duplex 2202 (S32202) 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 Duplex 2202 (S32202) 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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