Carbon Steel Seamless Pipe
20# · 45# (comparable to ASTM A106 Gr.B / C45 applications)
General-purpose seamless pipe for machining, fluid transmission and structural use. Deep stock in the most common OD and wall combinations.
Products
2,200+ combinations, on the ground
Hengsheng is a stocking distributor, not a broker. Over 40,000 tonnes of seamless steel pipe sit in our yard in Shandong — with exceptional dispatch capability and the option to process everything before it ships.
Product range
What we stock
Four families cover most of what manufacturers ask us for. If your requirement is outside these ranges, ask anyway — non-standard stock is our specialty.
Alloy Steel Pipe
42CrMo · 40Cr · 35CrMo · 27SiMn · 30CrMnSiA · 20CrMnTi
Heat-treatable alloy grades for shafts, cylinders, gears and high-stress machined parts. Available as-rolled or quenched & tempered to your specified hardness.
Low-Alloy High-Strength Pipe
Q345B / C / D / E · Q390 series (comparable to S355 / EN 10210 applications)
Structural pipe with guaranteed impact properties down to −40 °C. Can be upgraded by heat treatment up to Q620 for demanding structures.
Large-Diameter Thick-Wall Pipe
OD up to 635 mm · wall thickness up to 140 mm
The hard-to-find sizes. Extra-large OD and heavy wall stock that most of the market doesn't carry — and we'll hold non-standard stock for repeat customers.
Browse the live stock list
1,700+ size combinations, searchable by grade, OD and wall thickness — with international grade equivalents.
Stock at a glance
| Total stock | 40,000+ t on the ground |
|---|---|
| Combinations | 2,200+ grade & size combinations in regular stock |
| Outside diameter | Φ95 – 635 mm |
| Wall thickness | 13 – 140 mm |
| Container loading | Multiple grades and sizes consolidated in one container — no single-size MOQ |
| Processing before shipment | Cutting · heat treatment · chamfering · threading · beveling |
Can't find your size?
Send us the grade, OD, wall thickness and length you need. With 2,200+ combinations in stock and a trading network built over 35 years, we locate hard-to-find material fast — and for repeat requirements, we will hold dedicated stock for you.
Check availabilityOne container. Every size you need.
Mixed loading means you never buy pipe you can't use just to hit a minimum order. Tell us your list — we'll configure the container.