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 Welding Wire (Matched Cr-Mo-V Filler)
21CrMoV5-7 welding wire is low-hydrogen alloy filler offered for welding 21CrMoV5-7 (Werkstoff 1.7709) hardware. EN 10269 sets no filler requirements, so the filler is confirmed in the project weld procedure. Offered for SMAW (AWS A5.5 E9018-B3L), GTAW (AWS A5.28 ER90S-B3L), SAW (AWS A5.23 EB3 wire with appropriate flux), and FCAW (AWS A5.29 E91T1-B3) processes. EN 10269 gives no welding requirements; welding changes the quenched-and-tempered condition the EN 10269 properties depend on, so any weld needs a project-qualified procedure.
Filler Metal Classifications
| Process | AWS classification | EN ISO equivalent | Typical product |
|---|---|---|---|
| SMAW (stick electrode) | AWS A5.5 E9018-B3L | EN ISO 3580-A E CrMo2 B 4 2 H5 | Low-hydrogen basic-coated stick |
| GTAW (TIG) | AWS A5.28 ER90S-B3L | EN ISO 21952-A G CrMo2Si | Solid wire 1.6/2.4/3.2 mm |
| SAW (submerged arc) | AWS A5.23 EB3 wire | EN ISO 24598-A S CrMo2 | Wire 2.5/3.2/4.0 mm + appropriate flux |
| FCAW (flux core) | AWS A5.29 E91T1-B3 | EN ISO 17634-A T CrMo2 B M | Rutile or basic flux-cored wire 1.2/1.6 mm |
Wire Diameter Range
Solid GTAW wire: 1.6, 2.0, 2.4, 3.2 mm, supplied in 5 kg or 15 kg spool, cut-length 36 inch (914 mm) or 1000 mm. SAW wire: 2.5, 3.2, 4.0 mm, supplied in 25 kg coil or drum pack. SMAW stick electrodes: 2.5, 3.2, 4.0, 5.0 mm, supplied in 5 kg vacuum-packed cartons. FCAW wire: 1.2, 1.6 mm, supplied in 15 kg spool with sealed gas-tight package.
Inspection
EN 10204 type 3.1 mill test certificate by default with full chemistry on the deposit, all-weld-metal tensile at room temperature and at 540 deg C, Charpy V impact at 20 deg C on the deposit, diffusible hydrogen content (cap 5 ml per 100 g deposited to EN ISO 3690 / AWS A4.3), and hardness on the weld and HAZ. Type 3.2 with witness on call-out. Manufacturer's certificate to AWS A5.5 (or applicable AWS classification) plus the alloy modification declaration. WPS qualification to ASME Section IX or EN ISO 15614-1 held by the project welding engineer.
Storage and Handling
Low-hydrogen consumables require humidity-controlled storage. SMAW electrodes: re-bake at 350 deg C for 1 hour then transfer to 100-150 deg C holding oven; consume within 8 hours of removal from holding. GTAW + SAW wire: vacuum-packed or nitrogen-purged delivery; transfer to dry-storage cabinet (less than 50 percent relative humidity at 20 deg C) and consume within 30 days of pack opening. Diffusible hydrogen cap of 5 ml per 100 g deposited to ISO 3690 / AWS A4.3.
21CrMoV5-7 Chemistry (Werkstoff 1.7709 Element Ranges)
21CrMoV5-7 (Werkstoff 1.7709) chemistry is set by EN 10269:2013 Table 1 (cast analysis): carbon 0.17 to 0.25 percent, silicon max 0.40, manganese 0.40 to 0.80, phosphorus max 0.025, sulphur max 0.030, total aluminium max 0.030, chromium 1.20 to 1.50, molybdenum 0.55 to 0.80, nickel max 0.60 and vanadium 0.20 to 0.35 percent. Permissible product-analysis deviations from these limits are in EN 10269 Table 2.
| Element | Min % | Max % | Role |
|---|---|---|---|
| Carbon (C) | 0.17 | 0.25 | Q+T hardenability |
| Silicon (Si) | – | 0.40 | Deoxidation |
| Manganese (Mn) | 0.40 | 0.80 | Hardenability + solid-solution |
| Phosphorus (P) | – | 0.030 | Tramp limit for toughness |
| Sulphur (S) | – | 0.030 | Tramp limit |
| Chromium (Cr) | 1.20 | 1.50 | Hardenability + creep |
| Molybdenum (Mo) | 0.55 | 0.80 | Secondary hardening |
| Vanadium (V) | 0.20 | 0.35 | V4C3 carbide strengthening |
| Nickel (Ni) | – | 0.60 | Residual |
| Aluminium (Al) | – | 0.030 | Grain refinement |
21CrMoV5-7 Mechanical Properties
In the quenched-and-tempered condition (+QT, diameter up to 160 mm), EN 10269:2013 Table 4 requires 0.2 percent proof strength at least 550 MPa, tensile strength 700 to 850 MPa, elongation A at least 16 percent, reduction of area Z at least 60 percent and Charpy V impact energy KV2 at least 63 J at 20 deg C. Minimum 0.2 percent proof strength at elevated temperature (EN 10269 Table 6) is 500 MPa at 200 deg C, 460 MPa at 300 deg C, 410 MPa at 400 deg C, 380 MPa at 450 deg C and 350 MPa at 500 deg C; the standard gives no value at 550 deg C.
| Property | Value | Condition |
|---|---|---|
| Tensile (Rm) | 700 to 850 MPa | RT, Q+T |
| 0.2 percent proof (Rp0.2) | ≥550 MPa | RT, Q+T |
| Elongation A5 | ≥16 percent | RT, longitudinal |
| Charpy V impact (KV) | ≥63 J | 20 deg C, longitudinal |
| 0.2 percent proof at 500 deg C | ≥450 MPa | EN 10269 elevated-temp |
| Hardness (HBW) | 210 to 250 | Q+T condition |
Creep Data (EN 10269 Annex C)
EN 10269:2013 Annex C (Table C.1, informative mean values) gives the creep data for 21CrMoV5-7 from 420 to 550 deg C. Creep rupture strength for 100 000 h is 325 MPa at 450 deg C, 199 MPa at 500 deg C, 103 MPa at 540 deg C and 82 MPa at 550 deg C. The strength for 1 percent creep strain in 100 000 h is 288 MPa at 450 deg C, 156 MPa at 500 deg C and 56 MPa at 550 deg C. EN 10269 states that these values do not mean the steel can be used in continuous duty up to these temperatures: the total stress in service governs, and oxidation must be considered where relevant.
Heat Treatment (Q+T Cycle)
EN 10269:2013 Table B.1 gives the heat treatment guidance for 21CrMoV5-7 (+QT): harden from 880 to 950 deg C, cool in air, oil or water, then temper at 680 to 720 deg C for at least 2 hours. The quenched-and-tempered product must then meet EN 10269 Table 4: 0.2 percent proof strength at least 550 MPa and tensile strength 700 to 850 MPa for diameters up to 160 mm.
Welding Notes
EN 10269 gives no welding requirements for 21CrMoV5-7. Welding changes the quenched-and-tempered condition that the EN 10269 properties depend on, so any weld on this steel needs a procedure qualified for the project, covering filler, preheat and post-weld heat treatment.
Material Selection: 21CrMoV5-7 vs ASTM A193 B16 vs B7 vs Durehete 1055
21CrMoV5-7 sits between ASTM A193 Grade B7 (chromium-molybdenum, no vanadium) and 20CrMoVTiB4-10 (1.7729, Durehete 1055). The closest US grade, ASTM A193 Grade B16, has carbon and chromium ranges that do not overlap 21CrMoV5-7, so it is comparable, not equivalent.
21CrMoV5-7 Applications by Industry
21CrMoV5-7 is used for elevated-temperature bolting in power generation, refinery and petrochem plant. DIN 267-13 Table 2 lists it (+QT, symbol GA) with specified proof and tensile strengths up to 500 deg C and creep data up to 550 deg C.
- Steam Turbine Bolts
- Gas Turbine Bolts
- Power Plant Bolting
- Pressure Vessel Bolts
- Boiler Bolts
- Heat Exchanger Bolts
- Fired Heater Bolts
- Petrochem Reactor Bolts
Related 21CrMoV5-7 Forms and Fasteners
21CrMoV5-7 is supplied across the full bolting form-factor range, all to EN 10269 with EN 10204 type 3.1 mill test certificate by default and type 3.2 with third-party witness on call-out.
- Round Bar: raw stock OD 16 to 300 mm
- Bolts (Hub): all bolt form-factors
- Stud Bolts: M12 to M120, lengths 50 to 800 mm
- Hex Bolts + Heavy Hex Bolts
- Tap Studs + Body-Bound Studs
- Weld Studs: drawn-arc stud-welded fasteners
- Anchor Bolts + U-Bolts
- Threaded Rod + Welding Wire
- Nuts + Washers
- Forgings: closed-die and open-die blanks up to 800 kg
Request a Quote
TorqBolt supplies 21CrMoV5-7 (Werkstoff 1.7709) bolting stock and finished fasteners worldwide from Mumbai head office and Rajkot production plant. Type 3.1 EN 10204 mill test certificate by default; type 3.2 with Lloyd's Register, DNV, BV, SGS or TUV witness inspection on call-out. Send your enquiry →
Frequently Asked Questions
Q. How is filler chosen for 21CrMoV5-7?
EN 10269 gives no welding requirements; welding changes the quenched-and-tempered condition the EN 10269 properties depend on, so any weld needs a project-qualified procedure. Filler choice and any PWHT are fixed by that procedure.
Q. What is the diffusible hydrogen limit for 21CrMoV5-7 welding?
Cap 5 ml per 100 g deposited weld metal to EN ISO 3690 or AWS A4.3 test method. Higher diffusible hydrogen risks HAZ cracking in the Cr-Mo-V chemistry under restraint stress. Low-hydrogen consumables stored to the manufacturer humidity-control requirements.
Q. Can I substitute B3L filler for 21CrMoV5-7?
Only if the project-qualified weld procedure accepts it. EN 10269 sets no filler requirements, and no source in the library shows that B3L filler shares the 21CrMoV5-7 Cr-Mo-V chemistry window.
Q. Do you supply welding wire alongside 21CrMoV5-7 bolting stock?
Yes. Matched-chemistry filler for SMAW + GTAW + SAW + FCAW ships from TorqBolt as part of the 21CrMoV5-7 fastener supply package on call-out. Heat-lot traceability between the bolting bar and the matched filler is documented on the EN 10204 type 3.1 certificate.
Q. What is the AWS A5.5 B3L vs B3 difference?
The "L" suffix indicates "Low Carbon": carbon capped at 0.05 percent vs 0.10 percent for the standard B3. The L variant gives better impact toughness and lower HAZ hardness. For 21CrMoV5-7 the L variant is preferred for thick sections and for high-cycle service where HAZ toughness matters.
Related 21CrMoV5-7 Fastener Forms
Browse the full 21CrMoV5-7 form-factor range: Bolts · Stud Bolts · Hex Bolts · Heavy Hex Bolts · Tap Studs · Body-Bound Studs · Anchor Bolts · U-Bolts · Threaded Rod · Weld Studs · Nuts · Washers · Round Bar · Forgings.
Reference data: Mechanical Properties · Creep-Rupture · Welding Notes · Bolt Dimensions. Back to the 21CrMoV5-7 Alloy Hub.
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