ASTM A672 C70 Pipe Carbon Steel — Factory Direct Supplier | Huaxia-Steel
ASTM A672 C70 pipe is an electric-fusion-welded (EFW) carbon steel pipe made from ASTM A516 Grade 70 plate, intended for moderate-temperature pressure service. Specified under ASME SA672, it is widely used in refineries, chemical plants, and power stations where the design code demands welded construction with documented plate traceability. Huaxia-Steel supplies A672 C70 pipe in a wide size range from Chinese mills.
Product Overview
A672 C70 pipe begins as pressure-vessel-quality A516 Gr.70 plate that is formed, longitudinally welded by electric-fusion (submerged-arc or electroslag), and then stress-relieved or normalized. The result is a pipe with the chemistry and weld quality of A516 plate but the dimensional flexibility of a welded product. A672 covers diameters from 16 inches (406 mm) up to 92 inches (2340 mm) and beyond.
Specifications
| Item | Details |
|---|---|
| Grade | ASTM A672 Class 70 (also ASME SA672 C70) |
| Plate feedstock | ASTM A516 Grade 70 (dual certified) |
| Outside diameter | 406 mm – 2340 mm (16 in – 92 in) |
| Wall thickness | 6 mm – 100 mm (heavier on request) |
| Length | Single random, double random, cut-to-length |
| Welding process | Electric-fusion-weld (EFW), submerged-arc welded (SAW) |
| Delivery condition | Stress-relieved (SR) or normalized (N) |
| Tolerance | ASTM A530 or per spec |
Available Grades
From the same EFW production lines, we also supply the wider A672 family:
- ASTM A672 C55 – A516 Grade 55 plate feedstock, lower strength
- ASTM A672 C60 – A516 Grade 60 plate feedstock
- ASTM A672 C65 – A516 Grade 65 plate feedstock
- ASTM A672 C70 – A516 Grade 70 plate feedstock, the workhorse
- ASTM A672 L65 / L70 / L75 – cold-rolled feedstock variants for thinner wall and tighter tolerance
Manufacturing Standards
- ASTM A672/A672M (electric-fusion-welded steel pipe for high-pressure service at moderate temperatures)
- ASME SA672/SA672M (pressure-piping code compliance)
- ASTM A516/A516M (plate feedstock)
- ASTM A530 (general pipe requirements)
- ASME B31.1 / B31.3 (power and process piping)
- EN 10028-2 P355GH equivalent for European projects
Applications
- Refinery and petrochemical column shells
- Atmospheric and pressurized storage tank shells
- Power plant ductwork, ash handling, and flue systems
- Heat exchanger shells and headers
- Process piping headers and large-bore manifolds
- LNG cargo containment and regasification piping
Quality Assurance
Every plate used in A672 C70 pipe is supplied with MTC EN 10204 3.1 showing heat number, chemistry, tensile properties, and impact data. The finished pipe receives 100% radiographic or ultrasonic testing of the longitudinal weld. Supplementary requirements (S1 through S18 per ASTM A672) are available, including impact testing at -46 degrees C, post-weld heat treatment, and product analysis. Third-party inspection by SGS, BV, TUV, or Lloyds is standard for export orders.
Packing and Shipping
Single pipes are typically end-capped, strapped in bundles, and wrapped in VCI paper or plastic film. Heavy-wall and large-diameter pipes are shipped loose on flat-rack containers or break-bulk vessels. Marking per ASTM A672 includes grade, class, heat number, dimensions, and buyer reference. We arrange FOB, CFR, and CIF shipping from Tianjin, Shanghai, and Qingdao.
Why Buy ASTM A672 C70 Pipe from Huaxia-Steel?
- Mill-direct pricing for large-diameter pressure pipe
- ASME + ASTM dual certification with full plate traceability
- Wide OD range from 16 inches to 92 inches plus custom sizes
- Stress-relieved or normalized supply per ASME code
- 100% weld NDT and third-party inspection coordinated on request
Need ASTM A672 C70 electric-fusion-weld pipe for a pressure project? Send us your diameter, wall thickness, length, and quantity. Our team will deliver a detailed proposal within one working day, including plate traceability and NDT scope.
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