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Product Detail

Small-diameter seamless steel pipe

Process: Cold drawing and cold rolling, bright annealing
Surface: Bright outer wall without oxide skin
Ra：≤1.6‑3.2μm
Material: Common 20 #, 45 # Q355B
Specification: Outer diameter 4-60mm, wall thickness 0.8-12mm customizable

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Product Detail

Product Overview：

Precision bright tube is a high-precision steel pipe material processed through precision rolling or cold drawing. Due to its advantages such as no oxide layer on the inner and outer walls, no leakage under high pressure, high precision, high smoothness, no deformation in cold bending, no cracks in expanding or flattening, it is mainly used to produce pneumatic or hydraulic components, such as cylinders or hydraulic cylinders, which can be seamless or welded tubes. The chemical composition of precision bright tubes includes carbon (C), silicon (Si), manganese (Mn), sulfur (S), phosphorus (P), and chromium (Cr). It is used in precision seamless tubes for automobiles, motorcycles, construction machinery, jacks, power tools, sports equipment, and other fields.

Product List
Product Name:	Cold-drawn seamless capillary steel tube \| Seamless tube
Product Name:	Cold-rolled capillary seamless steel tube \| Seamless tube
Product Name:	10# small-diameter seamless steel pipe \| seamless pipe
Product Name:	20# small-diameter seamless steel pipe \| seamless pipe
Product Name:	45# small-diameter seamless steel pipe \| seamless pipe
Product Name:	Q235 small-diameter seamless steel pipe \| seamless pipe
Product Name:	Q345 small-diameter seamless steel pipe \| seamless pipe
Product Name:	16Mn small-diameter seamless steel pipe \| seamless pipe
Product Name:	40Cr small-diameter seamless steel pipe \| seamless pipe
Product Name:	27SiMn small-diameter seamless steel pipe \| seamless pipe
Product Name:	12Cr1MoV small-diameter seamless steel pipe \| seamless pipe
Product Name:	15CrMo small-diameter seamless steel pipe \| seamless pipe

Parameter range
Outer diameter	Φ6mm - Φ60mm (small diameter range)
Wall thickness	0.5mm-10mm
Standard length	1-12m, customizable shorter lengths supported
Outer diameter accuracy	Maximum ±0.03mm
Executive Standards	DIN 2391, EN 10305-1, ASTM A519, GB/T 3639
Non-standard customization	Customizable non-standard outer diameter, wall thickness, and inner hole honing

High frequency spot specifications on the market
Outer diameter (mm)	10	12	14	16	18	20	22	25
Market standard wall thickness (mm)	1.5、2、2.5	1.5、2、2.5、3	1.5、2、2.5、3、3.5	1.5、2、2.5、3、4	2、2.5、3、3.5、4	2、2.5、3、3.5、4、5	2、2.5、3、4、5	2、2.5、3、3.5、4、5、6
Nominal diameter DN	-	-	-	-	-	DN15	-	DN20

Outer diameter (mm)	28	32	38	42	45	48	51	57
Market standard wall thickness (mm)	2.5、3、3.5、4、5、6	2.5、3、3.5、4、5、6、8	3、3.5、4、5、6、8	3、3.5、4、5、6、8、10	3、3.5、4、5、6、8、10	3、3.5、4、5、6、8、10	3、3.5、4、5、6、8、10	3、3.5、4、5、6、8、10、12
Nominal diameter DN	-	DN25	-	DN32	-	DN40	-	DN50

Outer diameter (mm)	60	70	76	83	89	95	102	108
Market standard wall thickness (mm)	3、3.5、4、5、6、8、10、12	3.5、4、5、6、8、10、12、14	4、5、6、8、10、12、14、16	4、5、6、8、10、12、14	4、5、6、8、10、12、14、16	4、5、6、8、10、12、14	4、5、6、8、10、12、14、16	4、5、6、8、10、12、14、16、20
Nominal diameter DN	-	-	DN65	-	DN80	-	-	DN100
Industry caliber: Small caliber seamless pipes with an outer diameter ≤ 114mm (mainly cold drawn/cold-rolled)

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

Common outer diameter tolerance
Outer Diameter (mm)	20	25	32	38	45	51
Outer diameter tolerance (mm)	±0.15	±0.19	±0.24	±0.29	±0.34	±0.38
Qualified range (mm)	19.85-20.15	24.81-25.19	31.76-32.24	37.71-38.29	44.66-45.34	50.62-51.38

Outer Diameter (mm)	57	620	76	89	108	114
Outer diameter tolerance (mm)	±0.43	±0.45	±0.57	±0.67	±0.81	±0.86
Qualified range (mm)	56.57-57.43	59.55-60.45	75.43-76.57	88.33-89.67	107.19-108.81	113.14-114.86
Allowable deviation of outer diameter: ± 0.75% D or ± 0.30 mm, whichever is greater

Allowable deviation of wall thickness (cold drawn tube)
Wall thickness (mm)	S ≤ 3	3＜S ≤ 10	S＞10
Allowable deviation of wall thickness	+15% S or ± 0.15mm, whichever is greater	+12.5%S / −10%S	±10%S

Length and bending tolerance
Project	Fixed length	Fixed length	Bending degree per meter	Full length curvature
Specification conditions	L ≤ 6m	L＞6m	all	≤1.5 mm/m
Allowable deviation	+30 / 0 mm	+50 / 0 mm	all	≤ Total length × 0.15%
The above table shows the GB/T8162-8163 standard for ordinary fluid/structural cold drawn tubes; Hydraulic precision bright small caliber tube execution: GB/T 3639-2021, with higher accuracy and smaller tolerances.

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:	Cold-drawn seamless capillary steel tube \| Seamless tube
Product Name:	Cold-rolled capillary seamless steel tube \| Seamless tube
Product Name:	10# small-diameter seamless steel pipe \| seamless pipe
Product Name:	20# small-diameter seamless steel pipe \| seamless pipe
Product Name:	45# small-diameter seamless steel pipe \| seamless pipe
Product Name:	Q235 small-diameter seamless steel pipe \| seamless pipe
Product Name:	Q345 small-diameter seamless steel pipe \| seamless pipe
Product Name:	16Mn small-diameter seamless steel pipe \| seamless pipe
Product Name:	40Cr small-diameter seamless steel pipe \| seamless pipe
Product Name:	27SiMn small-diameter seamless steel pipe \| seamless pipe
Product Name:	12Cr1MoV small-diameter seamless steel pipe \| seamless pipe
Product Name:	15CrMo small-diameter seamless steel pipe \| seamless pipe

Parameter range
Outer diameter	Φ6mm - Φ60mm (small diameter range)
Wall thickness	0.5mm-10mm
Standard length	1-12m, customizable shorter lengths supported
Outer diameter accuracy	Maximum ±0.03mm
Executive Standards	DIN 2391, EN 10305-1, ASTM A519, GB/T 3639
Non-standard customization	Customizable non-standard outer diameter, wall thickness, and inner hole honing

High frequency spot specifications on the market
Outer diameter (mm)	10	12	14	16	18	20	22	25
Market standard wall thickness (mm)	1.5、2、2.5	1.5、2、2.5、3	1.5、2、2.5、3、3.5	1.5、2、2.5、3、4	2、2.5、3、3.5、4	2、2.5、3、3.5、4、5	2、2.5、3、4、5	2、2.5、3、3.5、4、5、6
Nominal diameter DN	-	-	-	-	-	DN15	-	DN20

Outer diameter (mm)	28	32	38	42	45	48	51	57
Market standard wall thickness (mm)	2.5、3、3.5、4、5、6	2.5、3、3.5、4、5、6、8	3、3.5、4、5、6、8	3、3.5、4、5、6、8、10	3、3.5、4、5、6、8、10	3、3.5、4、5、6、8、10	3、3.5、4、5、6、8、10	3、3.5、4、5、6、8、10、12
Nominal diameter DN	-	DN25	-	DN32	-	DN40	-	DN50

Outer diameter (mm)	60	70	76	83	89	95	102	108
Market standard wall thickness (mm)	3、3.5、4、5、6、8、10、12	3.5、4、5、6、8、10、12、14	4、5、6、8、10、12、14、16	4、5、6、8、10、12、14	4、5、6、8、10、12、14、16	4、5、6、8、10、12、14	4、5、6、8、10、12、14、16	4、5、6、8、10、12、14、16、20
Nominal diameter DN	-	-	DN65	-	DN80	-	-	DN100
Industry caliber: Small caliber seamless pipes with an outer diameter ≤ 114mm (mainly cold drawn/cold-rolled)

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

Common outer diameter tolerance
Outer Diameter (mm)	20	25	32	38	45	51
Outer diameter tolerance (mm)	±0.15	±0.19	±0.24	±0.29	±0.34	±0.38
Qualified range (mm)	19.85-20.15	24.81-25.19	31.76-32.24	37.71-38.29	44.66-45.34	50.62-51.38

Outer Diameter (mm)	57	620	76	89	108	114
Outer diameter tolerance (mm)	±0.43	±0.45	±0.57	±0.67	±0.81	±0.86
Qualified range (mm)	56.57-57.43	59.55-60.45	75.43-76.57	88.33-89.67	107.19-108.81	113.14-114.86
Allowable deviation of outer diameter: ± 0.75% D or ± 0.30 mm, whichever is greater

Allowable deviation of wall thickness (cold drawn tube)
Wall thickness (mm)	S ≤ 3	3＜S ≤ 10	S＞10
Allowable deviation of wall thickness	+15% S or ± 0.15mm, whichever is greater	+12.5%S / −10%S	±10%S

Length and bending tolerance
Project	Fixed length	Fixed length	Bending degree per meter	Full length curvature
Specification conditions	L ≤ 6m	L＞6m	all	≤1.5 mm/m
Allowable deviation	+30 / 0 mm	+50 / 0 mm	all	≤ Total length × 0.15%
The above table shows the GB/T8162-8163 standard for ordinary fluid/structural cold drawn tubes; Hydraulic precision bright small caliber tube execution: GB/T 3639-2021, with higher accuracy and smaller tolerances.

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