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 Anchor Bolts (EN 10269 / 1.7709) Cr-Mo-V Q+T Bolting
21CrMoV5-7 anchor bolts are cast-in or grouted-in foundation bolts for high-temperature equipment anchorage, machined from EN 10269 1.7709 Cr-Mo-V Q+T bar. Used to anchor steam turbines, gas turbines, pressure vessels and heat exchangers to concrete foundations where the equipment metal temperature reaches the 21CrMoV5-7 service envelope at the anchorage interface.
Anchor Bolts Designs and Variants
Three common configurations: L-bolts and J-bolts (bent foundation bolts, the embedded end formed to a L or J for concrete grip); headed anchor bolts (straight-shank with hex head for concrete grip); straight-shank threaded anchors for grouted-in sleeve-anchor systems.
Size Range
| Configuration | Thread range | Embedded length |
|---|---|---|
| L-bolt / J-bolt (bent) | M16 to M64 | per ACI 318 / EC2 |
| Headed anchor bolt (straight) | M16 to M64 | per ACI 318 / EC2 |
| Sleeve anchor with threaded stud | M16 to M48 | customer specified |
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. Anchor bolt embedment depth and bend geometry per ACI 318 (US) or Eurocode 2 (EC2) (European). Threaded end to ISO 261 or ASME B1.1. Surface protection (hot-dip galvanizing or specialty coating) applied above the concrete interface.
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
Anchor bolts in 21CrMoV5-7 are specified for foundation anchorage of steam turbines, gas turbines, pressure vessels, heat exchangers and fired heaters where the anchorage interface sees elevated metal temperature transferred from the equipment skirt.
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. Why use 21CrMoV5-7 for anchor bolts instead of plain carbon steel?
When the equipment skirt transfers elevated metal temperature down to the anchorage interface (steam turbine skirts run 200 to 380 deg C; fired heater skirts can run higher), plain carbon steel anchor bolts would relax and lose preload over time. 21CrMoV5-7 holds preload through thermal cycling.
Q. What is the typical embedment depth for a 21CrMoV5-7 anchor bolt?
Per ACI 318 or Eurocode 2 design rules based on the design pull-out load and the concrete strength. Typical embedment is 12 to 20 times the bolt diameter for L-bolts and headed anchors.
Q. Do you supply the matching anchor template and grout sleeve?
Matching anchor templates (steel plate with drilled holes to position the anchor bolts during concrete placement) and PVC grout sleeves are supplied on call-out as part of the anchorage package.
Q. Are the anchor bolts hot-dip galvanized?
Above the concrete interface, hot-dip galvanizing to ISO 1461 or specialty coating (xylan / xylar) on call-out. The embedded portion is supplied bare for direct concrete bond.
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 · U-Bolts · Threaded Rod · Nuts · Washers · Forgings. Back to the 21CrMoV5-7 Alloy Hub.
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