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
21CrMoV5-7 Round Bar (EN 10269 / 1.7709) Cr-Mo-V Q+T Bolting
21CrMoV5-7 round bar is the raw stock from which all 21CrMoV5-7 fasteners are machined. Supplied in the quenched-and-tempered condition to EN 10269 and (for cold-drawn bright tolerance) to EN 10278, in diameters from OD 16 to 300 mm with EN 10204 type 3.1 by default.
Round Bar Designs and Variants
Two finish grades: hot-rolled black bar with mill scale (OD 50 to 300 mm) for forging blanks and large-diameter bolt blanks; cold-drawn bright bar to EN 10278 h9 / h10 tolerance class (OD 16 to 100 mm) for direct machining without skin removal. Peeled-and-polished bar (h11) supplied on call-out.
Size Range
| Form | Diameter range | Tolerance |
|---|---|---|
| Hot-rolled black | OD 50 to 300 mm | EN 10060 / DIN 1013 |
| Cold-drawn bright (h9/h10) | OD 16 to 100 mm | EN 10278 h9/h10 |
| Peeled-and-polished (h11) | OD 25 to 250 mm | EN 10278 h11 |
| Forged round (annealed) | OD 200 to 800 mm | per project drawing |
Mechanical Properties (Q+T, EN 10269)
| Property | Value | Condition |
|---|---|---|
| Tensile (Rm) | 700 to 850 MPa | RT, Q+T |
| 0.2 percent proof stress (Rp0.2) | ≥550 MPa | RT, Q+T |
| Elongation A5 | ≥16 percent | RT, longitudinal |
| Charpy V impact (KV) | ≥63 J | 20 deg C |
| 0.2 percent proof at 500 deg C | ≥450 MPa | elevated-temp |
| Hardness | 210 to 250 HBW | Q+T |
Standards Anchor
21CrMoV5-7 round bar is supplied to EN 10269 for chemistry, mechanicals and inspection. Cold-drawn bright bar additionally to EN 10278 for dimensional tolerance. Pressure-vessel parallel approval to VdTUV Wb 350. US dual-certification to ASTM A193 Grade B16 on call-out.
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
Round bar is the parent stock for the full bolting form-factor range: stud bolts, hex bolts, heavy hex bolts, tap studs, body-bound studs, anchor bolts, threaded rod and forged blanks for fasteners above OD 200 mm.
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.
Frequently Asked Questions
Q. What diameter range do you stock 21CrMoV5-7 round bar in?
Hot-rolled OD 50 to 300 mm in stock; cold-drawn bright OD 16 to 100 mm to EN 10278 h9/h10; peeled-and-polished OD 25 to 250 mm on call-out; forged round OD up to 800 mm on project order.
Q. Is the round bar supplied in Q+T or annealed condition?
Default delivery is quenched and tempered (Q+T) to EN 10269 mechanical-property floors. Annealed bar for further heat treatment by the fastener manufacturer is supplied on call-out.
Q. What surface finish tolerance can I expect on cold-drawn bright bar?
EN 10278 tolerance class h9 (closer) or h10 (standard) on diameter. Surface roughness Ra typically 1.6 to 3.2 micrometre. h11 peeled-and-polished on call-out for direct-machine bolt blanks.
Q. Do you supply round bar with EN 10204 type 3.2 certification?
Yes. Type 3.1 by default with full chemistry, Q+T cycle, mechanicals, hardness and dimensional report. Type 3.2 with Lloyd's Register, DNV, BV, SGS or TUV witness on call-out and standard for pressure-vessel and turbine procurement.
Related 21CrMoV5-7 Form Factors
Browse the full 21CrMoV5-7 form-factor range: Stud Bolts · Hex Bolts · Heavy Hex Bolts · Tap Studs · Body-Bound Studs · Anchor Bolts · U-Bolts · Threaded Rod · Nuts · Washers · Forgings. Back to the 21CrMoV5-7 Alloy Hub.
Satisfaction Survey
