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 S32760 | Zeron 100 Super Duplex Steel
Highly-alloyed super duplex steel for exceptional performance in aggressive chloride media
Grade S32760 (UNS S32760) is a premium super duplex stainless steel, widely known as Zeron 100, featuring a complex alloy composition of 25% chromium, 7% nickel, and 3.5% molybdenum with additions of tungsten and copper. Designated as ASTM A1082/A1082M F55, this grade is engineered to deliver exceptional resistance to pitting and crevice corrosion in warm seawater and aggressive acidic chloride environments, providing a PREN value exceeding 40. S32760 combines high mechanical strength and excellent impact toughness with superior resistance to stress corrosion cracking (SCC), making it the material of choice for offshore oil and gas production, chemical processing, flue gas desulfurization (FGD) systems, and subsea pipelines. Its unique tungsten addition enhances localized corrosion resistance, ensuring long-term structural integrity in the most demanding industrial and marine applications.
ASTM A1082/A1082M Grade S32760 Chemical Composition
| Grades | UNS Designation | Type | C | Mn | P | S | Si | Cr | Ni | Mo | N | Other ElementsB |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A1082/A1082M Duplex (Ferritic-Austenitic) Grades | S32760 | . . . | 0.030 | 1.00 | 0.030 | 0.010 | 1.00 | 24.0-26.0 | 6.0-8.0 | 3.0-4.0 | 0.20-0.30 | Cu 0.50-1.00,W 0.50-1.00,%Cr+3.3x%Mo +16x%N≥40 |
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ASTM A1082/A1082M Grade S32760 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) |
|---|---|---|---|---|---|---|
| S32760 | 2010 [1100] | 109 [750] | 80 [550] | 25 | 30 | 290 |
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ASTM A1082/A1082M Markings
| UNS Designation | Grade Symbol |
|---|---|
| S32760 | TB 32760 |
Frequently Asked Questions
What is Zeron 100 (S32760)?
Zeron 100 (S32760) is a stainless steel grade covered under ASTM A1082/A1082M for high-strength bolting in special-purpose applications such as pressure vessels. UNS designation S32760. Available as bolts, studs, screws and nuts manufactured by TorqBolt for global oil/gas/nuclear/power/marine sectors.
What are the mechanical properties of Zeron 100 (S32760) per ASTM A1082?
Mechanical property requirements for S32760 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 Zeron 100 (S32760) 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 Zeron 100 (S32760) 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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