Carbon Steel
Carbon Steel Tube & Pipe
Welded and seamless round, square and rectangular tube.
Quote within 24 working hours · Certificate type stated on the quote
Wall 1.0 – 40 mm · OD 15 – 630 mm · Q195 · Q235 · Q345 +2
Specification
Carbon Steel Tube & Pipe — Full Spec Range
These are the ranges we can quote against today. Anything outside them is a mill enquiry, not a stock call — we will say which in the first reply.
| Thickness | Wall 1.0 – 40 mm |
|---|---|
| Width | OD 15 – 630 mm |
| Length | Up to 12,000 mm |
| Alloy grades | Q195 · Q235 · Q345 · 20# · 45# |
| Tempers | Hot rolled · Cold rolled |
| Standards | GB/T 3091 · GB/T 8162 · ASTM A53 |
| Surface finish | Mill finish · Galvanized · Pickled |
| Typical applications | Structure · Pipeline · Machinery · Scaffold |
What the mill checks
Four Numbers That Decide Whether This Ships
1 Gauge at nine points
Thickness is measured across the full width, not at one spot. A coil that is on gauge at the edge and 0.04 mm light at the center will still pass a lazy check.
2 Mechanical properties per heat
Tensile, yield and elongation pulled from the actual heat, not from a nominal table. On request the values are reported on a 3.1 certificate with the heat number; a 2.2 statement is available where that is all your file requires.
3 Surface under raking light
Roller marks, oil stain, scratch and edge burr are checked before packing. Coated product is checked for film build and color delta.
4 Packing for the voyage
Kraft plus PE film, steel-strapped pallet, edge protector, desiccant. Photos of the strapping and seal number sent before sailing.
Also compare
Related Categories
Carbon Steel Section
Angle, channel, I-beam, H-beam and flat bar.
Section 20 – 400 mm · —
Carbon Steel Plate
Hot-rolled and cold-rolled plate in Q235 / Q345 / Q355.
1.0 – 300 mm · 1,250 – 2,500 mm
Carbon Steel Coil
Hot-rolled and cold-rolled coil for roll forming and stamping.
0.3 – 16 mm · 600 – 2,000 mm
Before you ask
Carbon Steel Tube & Pipe — Questions That Come Up
Which alloy grades and tempers can you supply in Carbon Steel Tube & Pipe?
Grades: Q195 · Q235 · Q345 · 20# · 45#. Tempers: Hot rolled · Cold rolled. If your grade is not on that list it is usually a mill enquiry rather than a no — send it and we will say which one, in the first reply.
What sizes does Carbon Steel Tube & Pipe cover?
Wall 1.0 – 40 mm thick, OD 15 – 630 mm wide, Up to 12,000 mm. Quoted against GB/T 3091 · GB/T 8162 · ASTM A53. Where a drawing names two standards, we confirm which one governs before the order, not after the inspection report.
What certificate comes with Carbon Steel Tube & Pipe?
EN 10204 3.1 with the heat analysis and mechanical results, or 2.2 where that is what your file requires. Third-party inspection by SGS or BV is available. The certificate type is confirmed on the quotation, before you commit.
What is the minimum order for Carbon Steel Tube & Pipe?
2 t for stocked flat-rolled. Below that we consolidate into a shared container, so the order still ships — it just waits for a sailing.
How fast do you quote Carbon Steel Tube & Pipe?
Quotation within 24 hours on working days. We price grade, temper, gauge and quantity in one reply, and say which standard governs if the drawing names two.
Where does the Carbon Steel Tube & Pipe come from?
From audited mills across 6 regions — Gongyi, Wuxi / Changzhou, Zouping / Binzhou, Foshan, Ningbo / Taizhou, Luoyang — each chosen for the process this product needs. You deal with one party; the mill allocation is our job, not yours.
Quote on Carbon Steel Tube & Pipe
Send grade, temper, thickness and quantity. You get price, lead time, MOQ and certificate type in one reply.