21CrMoV5-7 Heavy Hex Bolts (EN 10269 / 1.7709) Cr-Mo-V Q+T Bolting

21CrMoV5-7 heavy hex bolts are oversized-head hex bolts to ASME B18.2.1, machined from EN 10269 1.7709 Cr-Mo-V Q+T bar. The heavy hex head profile (larger across-flats and head height) gives a wider bearing surface for pressure-vessel and refinery-flange bolting where joint preload is high and bearing stress under the head needs to stay below the material yield.

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Heavy Hex Bolts Designs and Variants

Heavy hex bolts come in two main classifications: ASME B18.2.1 inch-series (1/2 inch to 4 inch) for ASME-spec flanges and pressure vessels; metric heavy hex (ISO 4014 metric equivalent) (M12 to M64) for European petrochem applications. Both ship with thread engagement length per the joint stack-up.

Size Range

Mechanical Properties (Q+T, EN 10269)

Standards Anchor

Manufactured to EN 10269 for chemistry and mechanicals. Head dimensions to ASME B18.2.1 heavy hex profile. Thread to ASME B1.1 (UN, UNC, UNF) or ISO 261 (metric). Pressure-vessel approval to VdTUV Wb 350. Dual-cert to ASTM A193 Grade B16.

Companion Hardware

Matched-grade Cr-Mo-V companions ship from the same heat lot on call-out: 21CrMoV5-7 nuts, washers, threaded rod, stud bolts and round bar.

Applications

Heavy hex bolts are specified in pressure vessel bolting to to ASME BPVC Section VIII Division 1, heat exchanger bolting (channel-head and shell-side), petrochem reactor flange bolting (hydrocracker manway and main flange), steam turbine casing-half-joint bolting, and fired heater bolting for refinery service.

Inspection Documentation

Default delivery is EN 10204 type 3.1 mill test certificate with heat number, melt-shop pour record, chemistry to EN 10269 21CrMoV5-7, room-temperature tensile and 0.2 percent proof stress, elevated-temperature 0.2 percent proof at the design temperature, Charpy V impact at 20 deg C, hardness, full Q+T cycle chart and dimensional report tied to the heat lot. Type 3.2 with Lloyd's Register, DNV, BV, SGS or TUV witness inspection on call-out and standard practice on turbine and pressure-vessel procurement.

21CrMoV5-7 Chemistry (Werkstoff 1.7709 Element Ranges)

21CrMoV5-7 (Werkstoff 1.7709) chemistry is fixed within a tight Cr-Mo-V Q+T window to EN 10269. Carbon at 0.17 to 0.25 percent gives the Q+T hardenability backbone without over-hardening for the secondary temper. Chromium at 1.20 to 1.50 percent provides through-thickness hardenability and stabilises the carbide network for creep. Molybdenum at 0.55 to 0.80 percent suppresses temper embrittlement and contributes to the secondary hardening peak. Vanadium at 0.20 to 0.35 percent drives the V4C3 precipitation during the 680 to 740 deg C temper that locks in the creep envelope. The chemistry window is shared with the AFNOR 20CDV5.7 (French) and Polish 21HMF designations.

Creep Performance at 500-550 deg C (EN 10269 Annex A)

The defining value-prop of 21CrMoV5-7 is the secondary-hardening creep envelope driven by V4C3 carbide precipitation. The fine V4C3 dispersion formed during the 680 to 740 deg C temper pins dislocation motion during long-time elevated-temperature service. The result is a 100,000-hour stress-rupture envelope to EN 10269 Annex A of approximately 340 MPa at 500 deg C, 290 MPa at 525 deg C, 260 MPa at 540 deg C, and 180 MPa at 550 deg C. Above 550 deg C the V4C3 coarsens faster than the design can tolerate; this is the boundary where the design must step up to Durehete 1055 (Alloy T41 / 1.7729) with Ti+B microalloying for grain-boundary pinning that extends the envelope to 568 deg C continuous service.

Heat Treatment (Q+T Cycle)

The standard cycle for 21CrMoV5-7 is austenitisation at 880 to 940 deg C with hold time of 1 hour per 25 mm section, followed by oil quench. The temper is at 680 to 740 deg C for minimum 2 hours then air cool. The temper temperature is chosen to land on the secondary-hardening peak; below 660 deg C the V4C3 carbide precipitation is under-developed and long-term creep performance suffers; above 750 deg C the carbides over-coarsen and the room-temperature yield drops below the EN 10269 floor of 550 MPa. For heavily machined fastener blanks where dimensional stability matters, a stress relief at 50 deg C below the final temper is recommended after machining.

Welding Procedure (Matched Cr-Mo-V Filler + PWHT)

21CrMoV5-7 is welded with matched-composition Cr-Mo-V low-hydrogen filler (AWS A5.5 E9018-B3L for SMAW, AWS A5.28 ER90S-B3L for GTAW, AWS A5.23 EB3 for SAW) under preheat 200 to 300 deg C and diffusible-hydrogen cap of 5 ml per 100 g deposited. Post-weld heat treatment at 690 to 720 deg C for 1 hour per 25 mm joint thickness, minimum 2 hours, slow furnace cool to 300 deg C then air cool. The PWHT re-tempers the heat-affected zone and restores creep performance. Hardness traverse across weld plus HAZ plus parent metal verifies the PWHT achieved the intended tempering; HAZ hardness must not exceed 320 HBW.

Material Selection: 21CrMoV5-7 vs ASTM A193 B16 vs B7 vs Durehete 1055

21CrMoV5-7 sits between ASTM A193 Grade B7 (carbon-Mo only, no vanadium, capped at 450 deg C) and Durehete 1055 (Alloy T41 with Ti+B microalloying, 568 deg C envelope). Its direct US cousin is ASTM A193 Grade B16, with overlapping Cr-Mo-V chemistry and similar 540 deg C service envelope. Dual-certification to EN 10269 21CrMoV5-7 plus ASTM A193 B16 from the same heat lot is standard practice on cross-procurement projects.

Frequently Asked Questions

Related 21CrMoV5-7 Form Factors

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