Cold Drawn Seamless Stainless Steel Precision Pipe Bright Surface Tight Tolerance ±0.03mm

Price Negotiable

Price: Negotiable (Request a Quote)

MOQ: 100kg

Delivery Time: 15-25days

Brand: Baosteel，TISCO

Product Description

Cold drawn seamless precision pipe is manufactured from solid billet through a process of piercing and cold drawing, resulting in no weld line, uniform wall thickness, and excellent dimensional accuracy. Compared to welded tubing, it offers superior pressure resistance and structural integrity, making it ideal for high-reliability applications.

Key Features:

No weld seam – homogeneous structure
Tight tolerance: OD/ID up to ±0.03mm
Smooth surface finish: Ra ≤ 0.4μm
Enhanced mechanical properties through cold working
Available in annealed, hard, or stress-relieved conditions

Product Specifications

Parameter	Details
Applicable Standards	ASTM A519, DIN 2391, EN 10305-1, JIS G3445, GB/T 3639
Common Grades	Stainless: 304/304L, 316/316L, 321 Carbon/Alloy: 20#, 45#, 4140, 4130
OD Range	6mm – 100mm (customizable up to 200mm)
Wall Thickness Range	1mm – 15mm
Length	Up to 12m fixed length, or cut-to-size
Process	Piercing → Cold drawing → Annealing → Straightening → Pickling / Bright finishing
Delivery Condition	Cold drawn (hard), stress-relieved, or annealed & pickled

Chemical Composition (Typical, %)

Stainless Steel Grades

Grade	C	Si	Mn	P	S	Cr	Ni	Mo
304	≤0.08	≤1.00	≤2.00	≤0.045	≤0.030	18.0-20.0	8.0-11.0	–
304L	≤0.03	≤1.00	≤2.00	≤0.045	≤0.030	18.0-20.0	8.0-12.0	–
316L	≤0.03	≤1.00	≤2.00	≤0.045	≤0.030	16.0-18.0	10.0-14.0	2.0-3.0

Carbon / Alloy Steel Grades

Grade	C	Si	Mn	P	S	Cr	Mo
20#	0.17-0.23	0.17-0.37	0.35-0.65	≤0.035	≤0.035	–	–
45#	0.42-0.50	0.17-0.37	0.50-0.80	≤0.035	≤0.035	–	–
4140	0.38-0.43	0.15-0.35	0.75-1.00	≤0.035	≤0.040	0.80-1.10	0.15-0.25

Third-party test reports available upon request.

Mechanical Properties

Stainless Steel Grades (Annealed)

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
304	≥520	≥205	≥35	≤187
304L	≥480	≥175	≥35	≤187
316L	≥480	≥175	≥35	≤187

Carbon / Alloy Steel Grades (As-drawn or Annealed)

Grade	Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Hardness (HB)
20#	Annealed	≥410	≥245	≤156
45#	Annealed	≥600	≥355	≤197
4140	Annealed	≥655	≥415	≤217
4140	Cold drawn + tempered	≥850	≥740	≤241

Hydraulic pressure test, eddy current test, and flattening test available upon request.

Applications

Due to its no-weld, homogeneous structure, cold drawn seamless precision pipe is widely used in high-pressure and high-safety industries:

Industry	Typical Uses
Hydraulic Systems	Hydraulic cylinders, piston rods, fluid power lines
Oil & Gas	Downhole tubing, instrument lines, control lines
Automotive	Fuel injection rails, steering components, axle housings
Mechanical Engineering	Precision shafts, bearing sleeves, structural parts
Aerospace	Hydraulic and fuel delivery lines
Power Generation	Boiler tubes, heat exchanger components