Zeron 100 stud Bolt UNS S32760 Faseners High-Performance Fasteners for Extreme Environments
Super Duplex S32760 stud bolts, also known as Zeron 100, are engineered for applications requiring exceptional strength and corrosion resistance.
Super Duplex UNS S32760 is one of the most common super duplex grade in the market. UNS S32760 is a super duplex stainless steel especially designed for service in aggressive chloride-containing environments and has additions of W and Cu compared to UNS S32750. It has very good resistance to localized corrosion and stress corrosion cracking in combination with high mechanical strength.
ASTM A1082 is a standard specification that covers high-strength stainless steel bolting materials, including bolts, screws, stud bolts, threaded rods, and nuts, intended for special-purpose applications such as pressure vessels.
What to know the difference between UNS S32760 and UNS S32750.
UNS S32760 Stud bolt Specifications
- Material Grade: UNS S32760 (Zeron 100)
- Standards: ASTM A479, ASTM A276, ASTM A182 F55,ASTM A1082
- Equivalent Designations: WNR 1.4501, SAF 32760
- Sizes:
- Metric: M6 to M100
- Imperial: ¼″ to 4″
- Thread Types: UNC, UNF, Metric Coarse & Fine
- Types Available: Full-thread, double-end, tap-end, and custom configurations
ASTM A1082 UNS S32760 is available in various forms to suit different applications:
- Bolts
- Stud bolts
- Threaded rods
- Nuts
- Washers
Mechanical Properties and hardness requirement of UNS S32760
| UNS Designation | Type | Condition | Tensile Strength, min, ksi [MPa] | Yield Strength,<sup>A</sup> min, ksi [MPa] | Elongation in 2 in. [50 mm] or 4D, min, % | Reduction of Area, min, %<sup>B,C</sup> | Brinell Hardness, max |
|---|---|---|---|---|---|---|---|
| S32760 | — | annealed | 109 [750] | 80 [550] | 25 | — | 310 |
Chemical Composition (%) of UNS S32760
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 24.0–26.0 |
| Nickel (Ni) | 6.0–8.0 |
| Molybdenum (Mo) | 3.0–4.0 |
| Nitrogen (N) | 0.20–0.30 |
| Copper (Cu) | 0.50–1.00 |
| Tungsten (W) | 0.50–1.00 |
| Carbon (C) | ≤ 0.030 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.010 |
Applications
Because of its high strength and corrosion resistance, S32760 stud bolts are ideal for:
- Offshore oil and gas platforms
- Subsea equipment
- Chemical processing plants
- Desalination facilities
- Marine engineering
- Power generation systems
Ordering Information
When specifying S32760 stud bolts, please provide:
- Size and Length: e.g., M20 × 150mm or ¾″ × 6″
- Thread Type: UNC, UNF, Metric Coarse/Fine
- Type: Full-thread, double-end, tap-end, etc.
- Standards Compliance: ASTM A479, ASTM A276, ASTM A182 F55
- Testing Requirements: e.g., MTC per EN 10204 3.1, PMI
- Surface Finish: Mill finish, PTFE coated
A typical Quality control Plan for the A1082 S32760 Stud Bolts
| Item NO | Activity | Activity Details | Acceptance Criteria |
| 1 | DOCUMENTS REVIEW / APPROVAL BEFORE PRODUCTION | Check the revision of the SPECs and Standards. | A276 A276M REV A 2016 |
| A1082 A1082M 2015 | |||
| Size standards are based on actual orders | |||
| 1.1 | Technical specification and Standard | Check the revision of the SPECs and Standards. | A276 A276M REV A 2016 |
| A1082 A1082M 2015 | |||
| Size standards are based on actual orders | |||
| 2 | MATERIAL INCOMING INSPECTION, VERIFICATION AND REVIEW OF MILL CERTIFICATES | Mill Certificates Review; | A276 A276M REV A 2016 |
| A1082/ A1082M 2015 | |||
| Shall be delivered in strain hardened condition | |||
| 2.1 | Base Material Incoming Inspection | Mill Certificates Review; | A276 A276M REV A 2016 |
| A1082/ A1082M 2015 | |||
| Shall be delivered in strain hardened condition | |||
| VT, diameter, length | Purchase Order | ||
| Raw material chemical composition recheck | A276 A276M REV A 2016 Table 1 | ||
| Ni content according to standard | |||
| Mechanical performance recheck | |||
| 3 | Manufacturing Process Control | Cutting according to customer Drawing or standard with appropriate allowance. | Customer required Length |
| 3.1 | Raw Material Cutting | Cutting according to customer Drawing or standard with appropriate allowance. | Customer required Length |
| 3.2 | Chamfering | 1 Pitch (thread pitch) x45° | API 6A Appendix C |
| API 6A Appendix C | |||
| 3.3 | Marking | LOGO and Material grade; | A1082 A1082M 2015 |
| 3.4 | Thread Rolling and Tapping | According to ASME B1.1 or B1.13M | ASME B1.1 |
| ASME B1.13M | |||
| 3.5 | NDT | 10%PT | ASTM A962/962M |
| 3.6 | Mechanical Property Test | Full – thread studs: | A276 A276M REV A 2016 |
| 3.6.1. Tensile test at Room Temperature (Per same heat No & Nominal diameter), Rp0.2 ≥ 725 MPa; Rm ≥ 860 MPa; A ≥ 16 %; RA ≥ 50 % | A1082 A1082M 2015 | ||
| Tensile test at Room Temperature (Per same heat No & Nominal diameter), Rp0.2 ≥ 725 MPa; Rm ≥ 860 MPa; a ≥ 16 %; RA ≥ 50 % | A276 A276M REV A 2016 | ||
| 3.6.2. Impact test (Per same Lot & Nominal diameter): | A1082 A1082M 2015 | ||
| Impact test at – 46°C, the minimum average energy is 45J, the minimum single energy is 35J. | |||
| 3.6.3. Hardness test: Test on the tensile test sampling studs. Hardness shall be less than 24~35HRC | |||
| Heavy Hex Nuts: | |||
| 3.6.4. Proof test (d≤1 1/2 “): Sampling as per below: | |||
| 3.6.5. Hardness test: 24~35HRC Sampling as per below: | |||
| Lot size Sampling | |||
| ≤800 1 | |||
| 801 – 8000 2 | |||
| 8001 – 22000 3 | |||
| ＞22000 5 | |||
| 3.7 | Microcosmic examination | 3.7.1. Corrosion test according to G48 Method A | ASTM G48 |
| Corrosion test corrosion rate < 1g/㎡ without pitting | |||
| 3.7.2. Ferrit content test according to E562 35%~55% | |||
| 3.7.3. Detrimental Phase test according to A923 | |||
| 3.8 | Coating(if required) | According to BM list | Coating process card |
| 3.9 | Coating inspection | 3.9.1. Thickness test: ASTM F1137 microscopic exam of the cross – section taken perpendicular to the significant surface | Coating process card |
| 3.9.2. Curing test for Xylan 1014: Whitford Test Method 115B; | |||
| Curing test for Xylan – 2: Whitford Test Method 115C; | |||
| 3.9.3. Adhesion Test: Whitford Test Method 132C; | |||
| 3.9.4. Sample size for all tests: ASTM F1470 Sample Size B; | |||
| 3.1 | Surface conditions inspection | 100% VT | ASTM A962/962M |
| 3.11 | Dimension final check | According to Fastener Inspection Procedure | Based on actual order criteria |
| 4 | Packing | Matching the nuts with studs, then put into carton according to customer requirements. And then put cartons into wooden box with film that against water and moisture. | Contract |
| 4.1 | Packing | Matching the nuts with studs, then put into carton according to customer requirements. And then put cartons into wooden box with film that against water and moisture. | Contract |
| 5 | Shipping | Mill Certificate | Contract |
