Thick-walled seamless steel pipe

Process: Hot rolling, cold drawing, stress relief annealing
Surface: The surface is regular and free of oxidation pits
Ra：≤3.2‑12.5μm
Material: Common 20 #, 45 # Q355B
Specification: Outer diameter 16-325mm, wall thickness 8-65mm customizable

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89*12 108*12 114*16 133*16 168*18 168*20 219*18 325*35 377*45 Custom Specs

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Product Detail

Product Overview：

The production and manufacturing process of thick walled seamless steel pipes can be divided into four basic methods: cold drawing/cold rolling/hot rolling/hot expansion. Materials such as 10 #, 20 #, 35 #, 45 #, 16Mn, 27SiMn, 15CrMo, 35CrMo, 12Cr1MoV, 10CrMo910 can be used, which 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. Thick walled seamless steel pipes are named after their appearance of thick walls and are mainly used in industries such as mechanical processing, coal mining and chemical engineering, and hydraulic steel.

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

Parameter range
Outer diameter	Φ16mm‑Φ325mm
Wall thickness	8mm‑65mm
Standard length	1‑12m， Can process customized short and long rulers
Outer diameter accuracy	Maximum ±0.05mm
Executive Standards	ASTM A106, API 5L, DIN 17175, GB/T 5310
Non-standard customization	Support customized non-standard wall thickness, inner hole honing, and pressure deep processing

High frequency spot specification table
Outer Diameter (mm)	89	108	114	133	159	168
Commonly available thick wall thickness in the market (mm)	12、14、16、18、20	12、14、16、18、20、22、25	12、14、16、18、20、25	12、14、16、18、20、25、30	14、16、18、20、25、30、35	14、16、18、20、25、30、35

Outer Diameter (mm)	219	273	325	377	426
Commonly available thick wall thickness in the market (mm)	16、18、20、22、25、30、35、40	18、20、22、25、30、35、40、45	20、25、30、35、40、45、50	20、25、30、35、40、45、50、55	25、30、35、40、45、50、55、60

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

Table of Outer Diameter Tolerance Values(GB/T8163-2018 Hot Rolling, S/D＞0.10， Ordinary level)
Outer diameter (mm)	89	108	114	133	159	168	219	273	325
Outer diameter tolerance ± (mm)	±0.89	±1.08	±0.14	±0.33	±1.59	±1.68	±2.19	±2.73	±3.25
Qualified lower limit upper limit (mm)	88.11-89.89	106.92-109.08	112.86-115.14	131.67-134.33	157.41-160.59	166.32-169.68	216.81-221.19	270.27-275.73	321.75-328.25
All calculations are based on fixed millimeter values, without a percentage formula; Outer diameter deviation: ± 1% D (minimum ± 0.5

Wall thickness tolerance value (Hot-rolled thick wall)
Wall thickness (mm)	12	14	16	18	20	22	25	30	35	40	45
Upper deviation (mm)	+1.50	+1.75	+2.00	+2.25	+2.50	+2.75	+3.13	+3.75	+4.38	+5.00	+5.63
Lower deviation (mm)	-1.20	-1.40	-1.60	-1.80	-2.00	-2.20	-2.50	-3.00	-3.50	-4.00	-4.50
Wall thickness qualified range (mm)	10.80-13.50	12.60-15.75	14.40-18.00	16.20-20.25	18.00-22.50	19.80-24.75	22.50-28.13	27.00-33.75	31.50-39.38	36.00-45.00	40.50-50.63
All calculations are based on fixed millimeter values, without a percentage formula; Wall thickness deviation:+12.5% S/-10% S

Wall thickness value of hot expansion thick walled tube (Deviation+17.5% S/-12.5% S)
Wall thickness (mm)	12	16	20	25	30
Upper deviation (mm)	+2.10	+2.80	+3.50	+4.38	+5.25
Lower deviation (mm)	‑1.50	‑2.00	‑2.50	‑3.13	‑3.75
Wall thickness qualified range (mm)	10.50‑14.10	14.00‑18.80	17.50‑23.50	21.87‑29.38	26.25‑35.25

Length&straightness (fixed values)
Project	Fixed length	Fixed length	Bending degree per meter
Condition	L ≤ 6m	L ≤ 6m	Thick walled S>15mm
Allowable deviation	+30 / 0 mm	+50 / 0 mm	≤2.0 mm/m

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

Parameter range
Outer diameter	Φ16mm‑Φ325mm
Wall thickness	8mm‑65mm
Standard length	1‑12m， Can process customized short and long rulers
Outer diameter accuracy	Maximum ±0.05mm
Executive Standards	ASTM A106, API 5L, DIN 17175, GB/T 5310
Non-standard customization	Support customized non-standard wall thickness, inner hole honing, and pressure deep processing

High frequency spot specification table
Outer Diameter (mm)	89	108	114	133	159	168
Commonly available thick wall thickness in the market (mm)	12、14、16、18、20	12、14、16、18、20、22、25	12、14、16、18、20、25	12、14、16、18、20、25、30	14、16、18、20、25、30、35	14、16、18、20、25、30、35

Outer Diameter (mm)	219	273	325	377	426
Commonly available thick wall thickness in the market (mm)	16、18、20、22、25、30、35、40	18、20、22、25、30、35、40、45	20、25、30、35、40、45、50	20、25、30、35、40、45、50、55	25、30、35、40、45、50、55、60

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

Table of Outer Diameter Tolerance Values(GB/T8163-2018 Hot Rolling, S/D＞0.10， Ordinary level)
Outer diameter (mm)	89	108	114	133	159	168	219	273	325
Outer diameter tolerance ± (mm)	±0.89	±1.08	±0.14	±0.33	±1.59	±1.68	±2.19	±2.73	±3.25
Qualified lower limit upper limit (mm)	88.11-89.89	106.92-109.08	112.86-115.14	131.67-134.33	157.41-160.59	166.32-169.68	216.81-221.19	270.27-275.73	321.75-328.25
All calculations are based on fixed millimeter values, without a percentage formula; Outer diameter deviation: ± 1% D (minimum ± 0.5

Wall thickness tolerance value (Hot-rolled thick wall)
Wall thickness (mm)	12	14	16	18	20	22	25	30	35	40	45
Upper deviation (mm)	+1.50	+1.75	+2.00	+2.25	+2.50	+2.75	+3.13	+3.75	+4.38	+5.00	+5.63
Lower deviation (mm)	-1.20	-1.40	-1.60	-1.80	-2.00	-2.20	-2.50	-3.00	-3.50	-4.00	-4.50
Wall thickness qualified range (mm)	10.80-13.50	12.60-15.75	14.40-18.00	16.20-20.25	18.00-22.50	19.80-24.75	22.50-28.13	27.00-33.75	31.50-39.38	36.00-45.00	40.50-50.63
All calculations are based on fixed millimeter values, without a percentage formula; Wall thickness deviation:+12.5% S/-10% S

Wall thickness value of hot expansion thick walled tube (Deviation+17.5% S/-12.5% S)
Wall thickness (mm)	12	16	20	25	30
Upper deviation (mm)	+2.10	+2.80	+3.50	+4.38	+5.25
Lower deviation (mm)	‑1.50	‑2.00	‑2.50	‑3.13	‑3.75
Wall thickness qualified range (mm)	10.50‑14.10	14.00‑18.80	17.50‑23.50	21.87‑29.38	26.25‑35.25

Length&straightness (fixed values)
Project	Fixed length	Fixed length	Bending degree per meter
Condition	L ≤ 6m	L ≤ 6m	Thick walled S>15mm
Allowable deviation	+30 / 0 mm	+50 / 0 mm	≤2.0 mm/m

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