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Product Detail

Seamless steel pipes for structural use

Process: Hot rolling, cold drawing, annealing and finishing
Surface: flat without obvious pits or burrs
Ra：≤6.3‑12.5μm
Material: commonly used 20 #, 45 # Q355B
Specification: Outer diameter 12-610mm, wall thickness 2.5-75mm customizable

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OD*WT（mm）

32*3 38*4 45*4 60*5 76*6 89*6 108*6 168*10 325*12 Custom Specs

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Product Detail

Product Overview：

Seamless steel pipes for structural use are suitable for commonly used seamless steel pipes in general and mechanical structures. They are a variety of seamless steel pipes classified according to their different uses, mainly used in general and mechanical structures. Seamless steel pipes for structural use are commonly used in industries such as chemical, petroleum, textile, medical, food, and machinery for corrosion-resistant pipelines, structural components, and parts. They are hot-rolled, expanded, cold-rolled, and cold drawn seamless steel pipes.

Product List
Product Name:	GB8162 Seamless Steel Pipe for Structural Use \| Seamless Pipe
Product Name:	20 # Seamless steel pipe for structure \| Seamless pipe
Product Name:	45 # Seamless steel pipe for structure \| Seamless pipe
Product Name:	Seamless steel pipes for hot-rolled structures
Product Name:	Seamless steel pipe for cold drawn structure
Product Name:	Seamless steel pipe for national standard structure \| Seamless pipe

Parameter range
Outer diameter	Φ6mm‑Φ219mm
Wall thickness	0.5mm‑20mm
Standard length	1‑12m， Support customization of short and long scales
Outer diameter accuracy	Maximum ± 0.03mm
Executive Standards	ASTM A519, EN 10297-1, DIN 17175, JIS G3444, GB/T 8162
Non-standard customization	Special inner holes, thickened wall thickness, strict tolerances, heat treatment, and end processing can all be customized

Commonly used hot rolling specifications in the market
Outer diameter (mm)	32	38	45	57	60	76	89	108
Common wall thickness (mm)	2.5，3.0，3.5	2.5，3.0，3.5，4.0	3.0，3.5，4.0	3.0，3.5，4.0，4.5	3.0，3.5，4.0，5.0	3.5，4.0，5.0，6.0	4.0，4.5，5.0，6.0	4.0，4.5，5.0，6.0

Outer diameter (mm)	133	159	168	219	273	325	377	426
Common wall thickness (mm)	4.5，5.0，6.0，8.0	5.0，6.0，7.0，8.0	5.0，6.0，8.0，10	6.0，7.0，8.0，10	7.0，8.0，10，12	8.0，10，12	9.0，10，12	10，12，14

Optional tolerance range
Tolerance control	Optional manufacturing process
Tolerance ≤ 0.05 mm	Cold rolling
Tolerance ≤ 0.10 mm	Cold rolling
Tolerance ≤ 0.30 mm	Cold drawing \| Cold rolling
Tolerance ≤ 0.50 mm	Cold drawing \| Hot rolling
Tolerance ≤ 1.00 mm	Hot rolling \| Hot expanding

Outer diameter tolerance
Steel pipe type	Allowable deviation of outer diameter
Hot rolled/expanded tube	± 1% D or ± 0.5mm, whichever is larger
Cold drawn/cold-rolled pipes	± 0.75% D or ± 0.3mm, whichever is larger

Wall thickness tolerance - Hot rolling
Outer diameter D (mm)	Wall thickness deviation
≤102	± 12.5% S or ± 0.4mm, whichever is larger
＞102	+12.5%S /‑10%S

Wall thickness tolerance - cold drawing
Wall thickness S (mm)	Wall thickness deviation
≤3	+15% S/-10% S or ± 0.15mm, whichever is larger
3‑10	+12.5%S/‑10%S
＞10	±10%S

S - nominal wall thickness, D - nominal outer diameter;

The tolerance of structural pipes is loose and cannot replace GB/T3639 precision pipe machining

Optional delivery status
Oil removal from oil pipes	Annealing and straightening	Steel pipe corrosion prevention
Steel pipe threading	Length cut-to-length	Steel pipe coating
Steel pipe cap	Exquisite bundling	Beveling

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Product Detail

Product Overview：

Product List
Product Name:	GB8162 Seamless Steel Pipe for Structural Use \| Seamless Pipe
Product Name:	20 # Seamless steel pipe for structure \| Seamless pipe
Product Name:	45 # Seamless steel pipe for structure \| Seamless pipe
Product Name:	Seamless steel pipes for hot-rolled structures
Product Name:	Seamless steel pipe for cold drawn structure
Product Name:	Seamless steel pipe for national standard structure \| Seamless pipe

Parameter range
Outer diameter	Φ6mm‑Φ219mm
Wall thickness	0.5mm‑20mm
Standard length	1‑12m， Support customization of short and long scales
Outer diameter accuracy	Maximum ± 0.03mm
Executive Standards	ASTM A519, EN 10297-1, DIN 17175, JIS G3444, GB/T 8162
Non-standard customization	Special inner holes, thickened wall thickness, strict tolerances, heat treatment, and end processing can all be customized

Commonly used hot rolling specifications in the market
Outer diameter (mm)	32	38	45	57	60	76	89	108
Common wall thickness (mm)	2.5，3.0，3.5	2.5，3.0，3.5，4.0	3.0，3.5，4.0	3.0，3.5，4.0，4.5	3.0，3.5，4.0，5.0	3.5，4.0，5.0，6.0	4.0，4.5，5.0，6.0	4.0，4.5，5.0，6.0

Outer diameter (mm)	133	159	168	219	273	325	377	426
Common wall thickness (mm)	4.5，5.0，6.0，8.0	5.0，6.0，7.0，8.0	5.0，6.0，8.0，10	6.0，7.0，8.0，10	7.0，8.0，10，12	8.0，10，12	9.0，10，12	10，12，14

Optional tolerance range
Tolerance control	Optional manufacturing process
Tolerance ≤ 0.05 mm	Cold rolling
Tolerance ≤ 0.10 mm	Cold rolling
Tolerance ≤ 0.30 mm	Cold drawing \| Cold rolling
Tolerance ≤ 0.50 mm	Cold drawing \| Hot rolling
Tolerance ≤ 1.00 mm	Hot rolling \| Hot expanding

Outer diameter tolerance
Steel pipe type	Allowable deviation of outer diameter
Hot rolled/expanded tube	± 1% D or ± 0.5mm, whichever is larger
Cold drawn/cold-rolled pipes	± 0.75% D or ± 0.3mm, whichever is larger

Wall thickness tolerance - Hot rolling
Outer diameter D (mm)	Wall thickness deviation
≤102	± 12.5% S or ± 0.4mm, whichever is larger
＞102	+12.5%S /‑10%S

Wall thickness tolerance - cold drawing
Wall thickness S (mm)	Wall thickness deviation
≤3	+15% S/-10% S or ± 0.15mm, whichever is larger
3‑10	+12.5%S/‑10%S
＞10	±10%S

S - nominal wall thickness, D - nominal outer diameter;

The tolerance of structural pipes is loose and cannot replace GB/T3639 precision pipe machining

Optional delivery status
Oil removal from oil pipes	Annealing and straightening	Steel pipe corrosion prevention
Steel pipe threading	Length cut-to-length	Steel pipe coating
Steel pipe cap	Exquisite bundling	Beveling