At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASTM A437/A437M. Standard specification for stainless and alloy-steel turbine-type bolting material specially heat treated for high-temperature service (studs, stud bolts, screws). Predominantly 12% Cr martensitic grades for steam-turbine and high-temperature flange bolting.
Standard specification for stainless and alloy-steel turbine-type bolting material specially heat treated for high-temperature service (studs, stud bolts, screws). Predominantly 12% Cr martensitic grades for steam-turbine and high-temperature flange bolting.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| B4B | S64152 | 12Cr-Mo-W-V martensitic |
| B4C | S64152 | 12Cr-Mo-W-V, lower strength temper |
| B4D | K22459 | 1Cr-0.5Mo low-alloy |
Minimum mechanical requirements per ASTM A437/A437M.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| B4B | 145 ksi (1000 MPa) | 105 ksi (720 MPa) | 13 | 331 HBW max |
| B4C | 115 ksi (790 MPa) | 85 ksi (585 MPa) | 18 | 277 HBW max |
| B4D (≤2.5 in) | 125 ksi (860 MPa) | 105 ksi (720 MPa) | 18 | 302 HBW max |
| B4D (>2.5-4 in) | 110 ksi (760 MPa) | 95 ksi (655 MPa) | 17 | 302 HBW max |
| Grade | Key Composition, % |
|---|---|
| B4B / B4C | Cr 11.0-12.5, Ni 0.50-1.00, Mo 0.90-1.25, W 0.90-1.25, V 0.20-0.30, C 0.20-0.25 |
| B4D | Cr 0.80-1.15, Mo 0.50-0.65, C 0.35-0.45 |
ASME SA-437; B4B/B4C similar to AISI 616/422 12Cr turbine steel; comparable service niche to ASTM A193 B6/B6X and A565.
For the official ASTM International standards catalogue, see the ASTM International standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We supply ASTM A437/A437M fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
Ananka Fasteners supplies every lot with full material traceability and third-party testing on request.
Standard specification for stainless and alloy-steel turbine-type bolting material specially heat treated for high-temperature service (studs, stud bolts, screws). Predominantly 12% Cr martensitic grades for steam-turbine and high-temperature flange bolting.
Ananka Fasteners supplies B4B, B4C, B4D to ASTM A437/A437M. See the Grades / Classes Covered table above for full details of each grade.
Minimum tensile strength, yield strength, elongation and hardness requirements vary by grade — see the Mechanical Properties table above for the complete breakdown.
We supply ASTM A437/A437M fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
Yes. For a quotation, provide the required fastener type, grade, nominal size, dimensional standard, quantity and any inspection or certificate requirements.
Need a fastener released to ASTM A437/A437M for an industrial project? Send the required fastener type, grade, size, quantity and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: ASTM A437/A437M requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASTM A437/A437M and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
