Thin-wall steel tube

Process: Cold drawing and cold rolling, bright annealing
Surface: The outer wall is shiny without peeling
Ra：≤1.6‑3.2μm
Material: Common 20 #, 45 # Q355B
Specification: Outer diameter 8-114mm, wall thickness 0.5-6mm customizable

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14*1.5 16*2 18*3 20*3 25*3.5 32*4 38*4 45*4 48*4 Custom Specs

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Product Detail

Product Overview：

The production and manufacturing process of thin-walled seamless steel pipes can be divided into four basic methods: cold drawing/cold rolling/hot rolling/hot expansion. It can be made of materials such as 10 #, 20 #, 35 #, 45 #, 16Mn, 27SiMn, 15CrMo, 35CrMo, 12Cr1MoV, 10CrMo910, etc. It can be applied to seamless steel pipes for general structures, seamless steel pipes for fluid transportation, seamless steel pipes for boilers, seamless steel pipes for petroleum cracking, seamless steel pipes for ships, etc. Thin walled seamless steel pipes are named after their external wall thickness and are mainly used in industries such as mechanical processing, coal mining and chemical engineering, and hydraulic steel.

Product List
Product Name:	10 # Thin walled seamless steel pipe \| Seamless pipe
Product Name:	20 # thin-walled seamless steel pipe \| seamless pipe
Product Name:	45 # thin-walled seamless steel pipe \| seamless pipe
Product Name:	Q235 thin-walled seamless steel pipe \| Seamless pipe
Product Name:	Q345 thin-walled seamless steel pipe \| seamless pipe
Product Name:	16Mn thin-walled seamless steel pipe
Product Name:	40Cr thin-walled seamless steel pipe
Product Name:	27SiMn thin-walled seamless steel pipe \| Seamless pipe
Product Name:	12Cr1MoV thin-walled seamless steel pipe \| Seamless pipe
Product Name:	15CrMo thin-walled seamless steel pipe \| Seamless pipe

Parameter range
Outer diameter	Φ6mm‑Φ219mm
Wall thickness	0.5mm‑6mm
Standard length	1‑12m， Customizable short and long rulers
Outer diameter accuracy	Maximum ± 0.03mm
Executive Standards	ASTM A519, EN 10305-1, DIN 2391, GB/T 3639
Non-standard customization	Support customized ultra-thin wall, non-standard outer diameter, and inner hole polishing

High frequency spot specification table (mainly cold drawn, S ≤ 4mm）
Outer Diameter (mm)	14	16	18	20	25	32	38
Standing wall thickness (mm)	1.5、2、2.5	1.5、2、2.5、3	2、2.5、3	2、2.5、3	2、2.5、3、3.5	2、2.5、3、3.5、4	2.5、3、3.5、4

Outer Diameter (mm)	45	48	57	60	76	89	108
Standing wall thickness (mm)	2.5、3、3.5、4	2.5、3、3.5、4	3、3.5、4	3、3.5、4	3、3.5、4	3、3.5、4	3、4

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 table (cold drawn thin-walled tube, ordinary grade)
Outer Diameter (mm)	20	25	32	38	45	57	76	89	108
Outer diameter ± tolerance (mm)	±0.15	±0.19	±0.24	±0.29	±0.34	±0.43	±0.57	±0.67	±0.81
Qualified range (mm)	19.85-20.15	24.81-25.19	31.76-32.24	37.71-38.29	44.66-45.34	56.57-57.43	75.43-76.57	88.33-89.67	107.19-108.81

Wall thickness tolerance table (S ≤ 4mm)
Wall thickness (mm)	1.5	2.0	2.5	3.0	3.5	4.0
Upper deviation (mm)	+0.23	+0.30	+0.38	+0.45	+0.44	+0.50
Lower deviation (mm)	-0.15	-0.20	-0.25	-0.30	-0.35	-0.40
Qualified range (mm)	1.35-1.73	1.80-2.30	2.25-2.88	2.70-3.45	3.15-3.94	3.60-4.50

Length and bending tolerance
project	Fixed length	Fixed length	Bending degree per meter
condition	L ≤ 6m	L＞6m	All thin-walled tubes
allowable deviation	+30 / 0 mm	+50 / 0 mm	≤1.5 mm/m
Precision thin-walled bright hydraulic pipes comply with GB/T 3639-2021, with higher accuracy and smaller tolerances, and are not mixed with fluid cold drawn pipes in this table.

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:	10 # Thin walled seamless steel pipe \| Seamless pipe
Product Name:	20 # thin-walled seamless steel pipe \| seamless pipe
Product Name:	45 # thin-walled seamless steel pipe \| seamless pipe
Product Name:	Q235 thin-walled seamless steel pipe \| Seamless pipe
Product Name:	Q345 thin-walled seamless steel pipe \| seamless pipe
Product Name:	16Mn thin-walled seamless steel pipe
Product Name:	40Cr thin-walled seamless steel pipe
Product Name:	27SiMn thin-walled seamless steel pipe \| Seamless pipe
Product Name:	12Cr1MoV thin-walled seamless steel pipe \| Seamless pipe
Product Name:	15CrMo thin-walled seamless steel pipe \| Seamless pipe

Parameter range
Outer diameter	Φ6mm‑Φ219mm
Wall thickness	0.5mm‑6mm
Standard length	1‑12m， Customizable short and long rulers
Outer diameter accuracy	Maximum ± 0.03mm
Executive Standards	ASTM A519, EN 10305-1, DIN 2391, GB/T 3639
Non-standard customization	Support customized ultra-thin wall, non-standard outer diameter, and inner hole polishing

High frequency spot specification table (mainly cold drawn, S ≤ 4mm）
Outer Diameter (mm)	14	16	18	20	25	32	38
Standing wall thickness (mm)	1.5、2、2.5	1.5、2、2.5、3	2、2.5、3	2、2.5、3	2、2.5、3、3.5	2、2.5、3、3.5、4	2.5、3、3.5、4

Outer Diameter (mm)	45	48	57	60	76	89	108
Standing wall thickness (mm)	2.5、3、3.5、4	2.5、3、3.5、4	3、3.5、4	3、3.5、4	3、3.5、4	3、3.5、4	3、4

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 table (cold drawn thin-walled tube, ordinary grade)
Outer Diameter (mm)	20	25	32	38	45	57	76	89	108
Outer diameter ± tolerance (mm)	±0.15	±0.19	±0.24	±0.29	±0.34	±0.43	±0.57	±0.67	±0.81
Qualified range (mm)	19.85-20.15	24.81-25.19	31.76-32.24	37.71-38.29	44.66-45.34	56.57-57.43	75.43-76.57	88.33-89.67	107.19-108.81

Wall thickness tolerance table (S ≤ 4mm)
Wall thickness (mm)	1.5	2.0	2.5	3.0	3.5	4.0
Upper deviation (mm)	+0.23	+0.30	+0.38	+0.45	+0.44	+0.50
Lower deviation (mm)	-0.15	-0.20	-0.25	-0.30	-0.35	-0.40
Qualified range (mm)	1.35-1.73	1.80-2.30	2.25-2.88	2.70-3.45	3.15-3.94	3.60-4.50

Length and bending tolerance
project	Fixed length	Fixed length	Bending degree per meter
condition	L ≤ 6m	L＞6m	All thin-walled tubes
allowable deviation	+30 / 0 mm	+50 / 0 mm	≤1.5 mm/m
Precision thin-walled bright hydraulic pipes comply with GB/T 3639-2021, with higher accuracy and smaller tolerances, and are not mixed with fluid cold drawn pipes in this table.

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