- All
- Product Name
- Product Keyword
- Product Model
- Product Summary
- Product Description
- Multi Field Search
Seamless low-carbon mechanical tube engineered for stable machining, clean welds, and predictable forming on high-volume lines.
Broad size coverage: hot-rolled OD Φ38–Φ1020, 3–90 mm WT; cold-rolled precision OD Φ6–Φ200, 0.5–30 mm WT.
Grade equivalents for global sourcing: 20# / AISI 1020 / S20C / 1.1151 / C22E / SM20C / G10200.
In-stock program with 5-ton MOQ and large-lot monthly capacity for schedule assurance.
| Quantity: | |
|---|---|
PRODUCT DESCRIPTION
This low carbon steel pipe is built to make your downstream work easier. The bore runs true and consistent, so boring bars track cleanly; the OD carries a uniform, satin-black mill oil that wipes to a smooth touch; when cut, the edge breaks clean without gritty tear-out. In fabrication cells, the tube welds without drama—arc starts smoothly, puddles stay controllable, and post-weld straightness holds. In machining, chips come off in steady curls; dimensional drift stays tight across long shifts, reducing tool babysitting.
The result for your operation: fewer rejects, faster setups, and predictable cycle times—especially on parts like hydraulic cylinder barrels, automotive sleeves, axles, pins, brackets, levers, and lifting hooks. The alloy’s forgability and weldability translate directly into less rework and more first-time-right pieces on every lot.
Size & Construction
Technique: Seamless (hot-rolled & cold-rolled/drawn)
Hot-rolled range: OD Φ38–Φ1020; WT 3–90 mm
Cold-rolled precision range: OD Φ6–Φ200; WT 0.5–30 mm
Shape: Round
Standards: ASTM / AISI / GB / DIN / BS / JIS
Grades: 20#; AISI 1020; S20C; 1.1151; C22E; SM20C; G10200
Stock: Yes | MOQ: 5 ton | Capacity: 30,000 t/month | Payment: T/T, L/C, PayPal
Typical applications: Pipeline transport, boiler, hydraulic/automotive, general machinery.
Chemical Composition (typical, 20#/1020):
| Element | C | Si | Mn | S | P | Cr | Ni | Cu |
|---|---|---|---|---|---|---|---|---|
| % | 0.17–0.20 | 0.17–0.37 | 0.35–0.65 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.25 | ≤0.25 |
Mechanical Properties (unheat-treated unless noted):
| Property | Spec |
|---|---|
| Tensile strength | ≥410 MPa |
| Yield strength | ≥245 MPa |
| Elongation | ≥25% |
| Hardness | ≤156 HB |
| Heat treatment example | Normalizing 910 °C, air cool |
| Microstructure | Ferrite + pearlite |
Machinability that lowers total cost: Stable ferrite-pearlite matrix and low hardness reduce tool wear and allow higher feeds without chatter.
Weld-friendly mild steel pipe: Low carbon enables clean GMAW/SMAW joints and reliable fixture fit-ups.
Process-fit sizing: Choose hot-rolled for heavy-wall strength or cold-drawn precision for tighter tolerances and smoother ID/OD when honing is critical.
Mechanical confidence: Typical 1020 mechanical tubing is selected for applications requiring close tolerances, smooth finishes, and definite physical properties—exactly where deviations are expensive.
Global grade equivalents: Simplifies cross-standard engineering and multi-site sourcing.
Inspection-ready: Production flow includes hydrostatic or flaw detection tests in accordance with common practice for seamless lines.
These are the common decision dimensions buyers compare across 1020/20# seamless tube offers.
Standards & Equivalents: ASTM A519 (mechanical tubing) for AISI/SAE 1020; cross-references to 20# (GB), C22E/1.1151 (DIN/EN).
Manufacture & Condition: Hot-rolled vs. cold-drawn precision; for precision lines, vendors emphasize tighter OD/WT tolerance and improved finish.
Size Envelope & Tolerances: OD from single-digit millimeters up to ~1 m+; cold-drawn tolerance tables are often published for small/medium OD.
Mechanical/Hardness Ranges: Properties vary by reduction and normalization; market listings cite tensile from ~410 MPa upward and Brinell ~119–235 as competitive benchmarks.
Surface & Finish: Black (oiled), pickled, or custom; black is frequently standard on precision cold-drawn offers.
Applications: Hydraulic cylinders, automotive shafts/frames, jigs/fixtures, general fluid transport—areas where close tolerance and weldability matter.
QA & NDT: Hydrotest or eddy-current/UT invitation is common in process descriptions.
Lead Time & Capacity: Typical small-batch customization cycles 7–15 days; capacity messaging in the 20–30 kt/month range appears in supplier specs.
Packaging & Logistics: Bundled with steel straps, plastic-woven wrap, and wood cases as required for export; length options often up to 12 m.
Marketplace Pricing Signals: Public listings show wide bands by OD/WT/surface/MOQ; buyers usually optimize “mild steel pipe price” via size consolidation and long-term contracts.
Stabilizes takt time: Cold-drawn precision options minimize hone/ream passes and reduce clamp-change cycles.
De-risks welding & forming: Low-carbon chemistry avoids brittle HAZ issues and supports predictable bend radii for fixtures and brackets.
Protects downstream coating/assembly: Smoother ID/OD and consistent wall reduce leak paths in hydraulic assemblies and improve seal life in cylinder barrels.
Sourcing simplicity: Equivalent grade mapping cuts engineering review time when replacing legacy tube mild steel specs across regions.
Full-spectrum sizes in one PO: From low carbon steel pipe heavy-wall hot-rolled to fine-tolerance cold-drawn, consolidated under one QC umbrella.
Capacity that protects your launch windows: 30,000 t/month and active stock let you ramp without multi-vendor juggling.
Transparent, global-ready documentation: Cross-standard grade callouts and process transparency (HT/NDT, etc.) simplify approval with your plant QA.
Commercial flexibility: 5-ton MOQ, standard T/T or L/C terms, and project-based scheduling.
Hydraulic cylinders: Reduced seal wear due to smooth ID; easier honing to final Ra.
Automotive & off-highway: Shafts, frames, pins, brackets—consistent yield strength supports light-weighting within safety margins.
General fluid transport: Reliable pressure handling where weld seams are a risk; black-oiled finish for corrosion delay in transit/storage.
Form factors: Round standard; mild steel box section (square/rectangular) available via adjacent product lines if required for your jigs/frames.
Finishes: Black-oiled standard; pickled/cleaned on request.
Lengths: Fixed cut-to-length; common supply up to 12,000 mm.
Inspection: Hydrotest or NDT per project spec.
Q1: Is ASTM 1020 (A519) the same as 1020 DOM (A513)?
A: No. 1020 DOM falls under ASTM A513 (welded + drawn-over-mandrel) and is often chosen for very tight tolerance on welded products. This product is seamless A519 mechanical tubing—selected when you need seamless integrity with close tolerances and defined mechanicals.
Q2: What tolerances can I expect on cold-drawn precision tubes?
A: Precision lines publish OD/ID deviation tables; practical tolerances tighten as OD decreases and are validated per drawing. Reference supplier tolerance tables for selection.
Q3: Can you normalize or supply specific heat treatment?
A: Yes—normalizing around 910 °C (air cool) is a standard route for 20#/1020 to balance strength/ductility prior to machining.
Q4: What NDT is available?
A: Hydrostatic testing and flaw-detection (e.g., eddy current/UT) are integrated in seamless process control and available to spec.
Q5: Typical lead time?
A: Make-to-order precision lots commonly run 7–15 days depending on size mix and finishing; stock sizes ship faster.
Zhongjing Steel Group (Guangdong) Co.,Ltd. specializes in the production of cold-rolled/hot-rolled coils, carbon steel pipes, bars, and PPGI materials. It is a modern enterprise integrating carbon steel production, processing, and trade. It is a Chinese iron and steel enterprise group.
