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 Forgings (EN 10269 / 1.7709) Cr-Mo-V Q+T Bolting
21CrMoV5-7 forgings are closed-die or open-die forged blanks in EN 10269 1.7709 supplied in the annealed condition for further heat treatment by the fastener manufacturer, or in the quenched-and-tempered (Q+T) condition for direct machining. The standard parent stock for large-diameter bolt blanks (above OD 200 mm) where rolled round bar tonnage is uneconomical.
Forgings Designs and Variants
Three product classifications: open-die forged round for cylindrical blanks (OD 200 to 800 mm); closed-die forged shapes for near-net-shape bolt heads, eye-bolt heads, and hammer-head bolts; upset-forged stud blanks for headed stud bolts where the head is forged from one end of a continuous shank.
Size Range
| Form | Size range | Condition |
|---|---|---|
| Open-die forged round | OD 200 to 800 mm, lengths to 3 m | Annealed or Q+T |
| Closed-die forged blanks | up to 800 kg piece weight | Annealed |
| Upset-forged stud blanks | M30 to M120 head, shank to 1.5 m | Annealed for re-heat by customer |
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
Manufactured to EN 10269 for chemistry. Forging reduction ratio minimum 3:1 to refine the cast structure. Heat treatment after forging: anneal at 700 to 750 deg C and slow cool for the customer to perform their own Q+T cycle, or full Q+T to EN 10269 mechanical-property floors for direct-machine delivery.
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
21CrMoV5-7 forgings are the parent stock for large-diameter fastener machining: stud bolts above M64, heavy hex bolts above 2 1/2 inch, tap studs above M64, and special-geometry pressure-vessel and turbine bolting per the OEM drawing. See round bar for diameters at or below 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 is the maximum forged blank size you can supply in 21CrMoV5-7?
Open-die forged round to OD 800 mm and length 3 m; closed-die forged blanks to 800 kg piece weight; upset-forged stud blanks with M120 head and 1.5 m shank. Larger sizes by special arrangement.
Q. Do you supply forgings in annealed condition for customer-side Q+T?
Yes. Default delivery on forgings above OD 300 mm is annealed (700 to 750 deg C, slow cool) for the customer to perform their own Q+T cycle in their facility. Q+T condition on call-out.
Q. What is the typical forging reduction ratio?
Minimum 3:1 to refine the cast structure and break up any segregation. Higher ratios (5:1 to 8:1) on call-out for nuclear and aerospace work where ASTM A788 forging-quality requirements apply.
Q. Do you supply non-destructive testing on the forging?
Ultrasonic inspection to ASTM A388 or EN 10228-3 on call-out for pressure-vessel forgings. Magnetic-particle inspection to ASTM E709 standard practice on bolt-blank surface.
Related 21CrMoV5-7 Form Factors
Browse the full 21CrMoV5-7 form-factor range: Round Bar · Stud Bolts · Hex Bolts · Heavy Hex Bolts · Tap Studs · Body-Bound Studs · Anchor Bolts · U-Bolts · Threaded Rod · Nuts · Washers. Back to the 21CrMoV5-7 Alloy Hub.
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