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- MERKBLATT AD 2000 W2/W7/W10
ASTM A193 (US Bolting Standard) (21CrMoV5-7 / EN 10269 / 1.7709)
ASTM A193 / ASME SA-193 is the US standard specification for alloy-steel and stainless-steel bolting for high-temperature and high-pressure service. The standard is the US counterpart to European EN 10269 and is the controlling spec for 21CrMoV5-7 cross-reference work: 21CrMoV5-7 (Werkstoff 1.7709) maps to ASTM A193 Grade B16 as the closest US bolting equivalent.
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Scope
ASTM A193 covers eight bolting grades organized by chemistry family: B5, B6, B6X (martensitic Cr stainless); B7, B7M, B16 (Cr-Mo and Cr-Mo-V low-alloy); B8 family (austenitic stainless). For 21CrMoV5-7 cross-reference, the relevant grade is B16 (Cr-Mo-V Q+T low-alloy for elevated-temperature service to 540 deg C).
A193 Grade Matrix Relevant to 21CrMoV5-7
| Grade | Chemistry | Service envelope | European cousin |
|---|---|---|---|
| B7 | Cr-Mo (no V) | up to 450 deg C | 42CrMo4 / EN 10269 sub-set |
| B7M | Cr-Mo low-hardness | NACE MR0175 sour service | 42CrMo4 NACE-trim |
| B16 | Cr-Mo-V Q+T | up to 540 deg C | 21CrMoV5-7 / Werkstoff 1.7709 |
| B8 / B8M | Austenitic 304 / 316 | cryogenic to 540 deg C | EN 10269 austenitic grades |
A193 Grade B16 to 21CrMoV5-7 Cross-Reference
A193 Grade B16 and 21CrMoV5-7 are close cross-references with overlapping Cr-Mo-V chemistry and similar Q+T cycle. The chemistry windows overlap in Cr (0.80 to 1.50), Mo (0.50 to 0.80), and V (0.20 to 0.35); EN 10269 sets a tighter Cr range (1.20 to 1.50). Procurement specifications that allow either grade typically print both designations on the same line. Detail on the dedicated vs ASTM A193 B16 cross-reference page.
Dual-Certification
21CrMoV5-7 (EN 10269) and ASTM A193 Grade B16 material is supplied dual-certified from the same Cr-Mo-V heat lot on call-out. The dual-certificate documents compliance to both standards: EN 10269 chemistry, mechanical and inspection categories; ASTM A193 chemistry, mechanical and ASME SA-193 acceptance.
Related ASTM Standards
Companion ASTM standards in the bolting space: ASTM A194 (nuts for high-pressure and high-temperature service; matched-grade nuts for A193 B16 are A194 grade 7); ASTM A320 (bolting for low-temperature service); ASTM A540 (special-quality alloy-steel bolting for nuclear and turbine service).
Frequently Asked Questions
Q. What is the closest ASTM A193 grade to 21CrMoV5-7?
ASTM A193 Grade B16. Both are Cr-Mo-V Q+T low-alloy bolting steels with overlapping chemistry and a similar service envelope around 540 to 550 deg C. Dual-certification from the same heat lot is supplied on call-out.
Q. Does ASTM A193 cover austenitic stainless bolting?
Yes. The B8 family (B8, B8M, B8C, B8T, B8N) covers austenitic 304, 316, 321, 347 and nitrogen-strengthened austenitic grades for cryogenic and corrosion-resistant bolting. For Cr-Mo-V high-temperature service, the relevant grades are B7, B7M and B16.
Q. What is the matched-nut standard for ASTM A193 Grade B16?
ASTM A194 Grade 7. The A194 Grade 7 matched nut is Cr-Mo-V Q+T with proof load matched to the A193 Grade B16 stud rating. Heavy hex configuration to ASME B18.2.2.
Q. Can I procure 21CrMoV5-7 material with ASME SA-193 acceptance?
Yes. ASME SA-193 is the ASME boiler-and-pressure-vessel-code-stamped version of ASTM A193 with identical technical content. Dual-certification to EN 10269 21CrMoV5-7 and ASME SA-193 Grade B16 is supplied on call-out for ASME pressure-vessel procurement.
Related Standards and Properties
Related standards: EN 10269 · EN 10278 · VdTUV Wb 350 · EN 10269 Equivalents. Properties pages: Chemistry · Mechanicals · Heat Treatment · Hardness · Creep-Rupture. Back to the 21CrMoV5-7 Alloy Hub.
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