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Carbon Seamless Steel Pipe

Keywords	Carbon Seamless Steel Pipe, CS SMLS Pipe, Seamless Steel Pipe, SMLS Pipe, Black Seamless Pipe
Size	OD: 1/2" (21.3mm) ~ 36" (914.4mm)
	WT: 2.11mm ~ 60mm
Standards & Materials	API 5L Gr. A/B/X42/X46/X52/X60/X70/X80, PLS1/PSL2
	API 5CT J55/K55/N80/L80/P110
	ASTM A53 Gr.B, ASTM A106 Gr. B, ASTM SA179, ASTM SA192
	ASTM SA210, ASTM A333 Gr.6, ASTM SA519 4140/4130
	DIN 17175, DIN 2391, DIN 1629, GOST 8731/8732 CT20

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Introduction
Specification
Material Properties
Process & Finishing
Test & QC
FAQ

Introduction

Our carbon seamless steel pipes (CS SMLS, black/MS/GI seamless pipe) meet mainstream ASTM, DIN and GOST international standards for global fluid, boiler, mechanical and low-temperature projects.

API SPEC 5L
Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
Line Pipes	API 5L	Ø10.3~1200 × WT1.0~120	A, B, X42, X46, X52, X60, X70, X80, PSL1 / PSL2

API SPEC 5CT
Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
Casing	API 5CT	Ø114~219 × WT5.22~22	J55, K55, N80, L80, P110
Tubing	API 5CT	Ø48.3~114.3 × WT3.2~16	J55, K55, N80, L80, P110

ASTM / ASME
Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
Black and Hot-Dipped Zinc-Coated Seamless Steel Pipes	ASTM A53	Ø10.3~1200 × WT1.0~150	Gr.A, Gr.B, Gr.C
Seamless Carbon Steel Pipes for High Temperature Service	ASTM A106	Ø10.3~1200 × WT1.0~150	Gr.B, Gr.C
Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes	ASTM A179	Ø10.3~426 × WT1.0~36	Low Carbon Steel
Seamless Carbon Steel Boiler Tubes for High Pressure	ASTM A192	Ø10.3~426 × WT1.0~36	Low Carbon Steel
Seamless Cold-Drawn Intermediate Alloy Steel Heat-Exchanger and Condenser Tubes	ASTM A199	Ø10.3~426 × 1.0~36	T5, T22
Seamless Medium-Carbon Steel Boiler and Superheater Tubes	ASTM A210	Ø10.3~426 × WT1.0~36	A1, C
Seamless Ferritic & Austenitic Alloy Steel Boiler, Superheater & Heat-Exchanger Tubes	ASTM A213	Ø10.3~426 × WT1.0~36	T5, T9, T11, T12, T22, T91
Seamless Carbon and Alloy Steel for Mechanical Tubing	ASTM A333	Ø1/4"~42" × WT SCH20~XXS	Gr.1, Gr.3, Gr.6
Seamless & Welded Carbon Steel Pipes and Alloy Steel Pipes for Low Temperature Use	ASTM A334	Ø1/4"~4" × WT SCH20~SCH80	Gr.1, Gr.6
Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes	ASTM A556	Ø10.3~426 × WT1.0~36	A2, B2

DIN
Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
Seamless Steel Tubes for Elevated Temperature	DIN 17175	Ø10~762 × WT1.0~120	St35.8, St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36
Seamless Steel Tubes	DIN 1629 / DIN 2391	Ø13.5~762 × WT1.8~120	St37.0, St44.0, St52.0, St52.3
Seamless Steel Tubes	DIN 2440	Ø13.5~165.1 × WT1.8~4.85	St33.2
Seamless Steel Pipes for Structural Purpose	DIN 2393	Ø16~426 × WT1.0~36	RSt34-2, RSt37-2, RSt44-2, St52

BS
Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
Seamless Steel Tubes for Machine Structure	BS 970	Ø10~762 × WT1.0~120	Carbon Steel
Seamless Steel Tubes for Boiler and Heat Exchangers	BS 3059	Ø10~762 × WT1.0~120	360, 410, 440, 460, 490

EN
Product Name	Standard	Size Range	Steel Grade
Seamless Steel Tubes for Pressure Purposes	EN 10216-1	OD 10.2–711 mm × WT 1.6–100 mm	P195TR1, P195TR2, P235TR1, P235TR2, P265TR1, P265TR2
Seamless Steel Tubes for Elevated Temperature Service	EN 10216-2	OD 10.2–711 mm × WT 1.6–100 mm	P195GH, P235GH, P265GH, 16Mo3, 13CrMo4-5, 10CrMo9-10
Seamless Circular Steel Tubes for Structural Purposes	EN 10210-1	OD 21.3–711 mm × WT 2.0–100 mm	S235JRH, S275J0H, S355J2H

JIS
Product Name	Standard	Size Range	Steel Grade
Seamless Carbon Steel Pipe for Pressure Service	JIS G3454	OD: 20–630 mm × WT: 2.5–50 mm	STPG370, STPG410
Seamless Carbon Steel Pipe for High Temperature Service	JIS G3456	OD: 20–630 mm × WT: 2.5–50 mm	STPT370, STPT410, STPT480
Seamless Carbon Steel Pipe forBoiler and Heat Exchangers	JIS G3461	OD: 20–630 mm × WT: 2.5–50 mm	STB340, STB410, STB510

GOST
Product Name	Standard	Size Range	Steel Grade
Hot-expanded & Hot-rolled Seamless Pipes for Oil, Gas and Water Transportation in CIS Countries	GOST 8731/8732	OD: 20–630 mm × WT: 2.5–50 mm	CT20

All standard pipes cover full SCH wall thickness range, pass hydro & UT NDT tests and support third-party certification to satisfy worldwide engineering procurement.

Specification

Our CS seamless pipes split into hot rolled & cold drawn two production lines, covering OD 1/2"–36", WT 2.11–60mm, full SCH schedules, theoretical weight data and standard fixed lengths shown in the below size chart.

Dimensional Tolerance (per ASTM/DIN/GOST specs)
- OD tolerance: ±1% nominal outer diameter
- WT tolerance: +12.5% / -10% nominal wall thickness
- Length tolerance: ±0.5% standard cut length

Custom Machining Available
Custom fixed-length cutting, end beveling, diameter reducing, threading & other tailored dimensional processing are supported to match project installation demands.

NOMINAL PIPE SIZE		OD (mm)	NOMINAL WALL THICKNESS
DN	NB(inch)	ASME	SCH10	SCH20	SCH30	STD	SCH40	SCH60	XS	SCH80	SCH100	SCH120	SCH140	SCH160	XXS
15	1/2"	21.3	2.11		2.41	2.77	2.77		3.73	3.73				4.78	7.47
20	3/4"	26.7	2.11		2.41	2.87	2.87		3.91	3.91				5.56	7.82
25	1"	33.4	2.77		2.9	3.38	3.38		4.55	4.55				6.35	9.09
32	1-1/4"	42.2	2.77		2.97	3.56	3.56		4.85	4.85				6.35	9.7
40	1-1/2"	48.3	2.77		3.18	3.68	3.68		5.08	5.08				7.14	10.15
50	2"	60.3	2.77		3.18	3.91	3.91		5.54	5.54				8.74	11.07
65	2-1/2"	73	3.05		4.78	5.16	5.16		7.01	7.01				9.53	14.02
80	3"	88.9	3.05		4.78	5.49	5.49		7.62	7.62				11.13	15.25
90	3-1/2"	101.6	3.05		4.78	5.74	5.74		8.08	8.08
100	4"	114.3	3.05		4.78	6.02	6.02		8.56	8.56		11.13		13.49	17.12
125	5"	141.3	3.4			6.55	6.55		9.53	9.53		12.7		15.88	19.05
150	6"	168.3	3.4			7.11	7.11		10.97	10.97		14.27		18.26	21.95
200	8"	219.1	3.76	6.35	7.04	8.18	8.18	10.31	12.7	12.7	15.09	18.26	20.62	23.01	22.23
250	10"	273	4.19	6.35	7.8	9.27	9.27	12.7	12.7	15.09	18.26	21.44	25.4	28.58	25.4
300	12"	323.8	4.57	6.35	8.38	9.53	10.31	14.27	12.7	17.48	21.44	25.4	28.58	33.32	25.4
350	14"	355.6	6.35	7.92	9.53	9.53	11.13	15.09	12.7	19.05	23.83	27.79	31.75	35.71
400	16"	406.4	6.35	7.92	9.53	9.53	12.7	16.66	12.7	21.44	26.19	30.96	36.53	40.19
450	18"	457.2	6.35	7.92	11.13	9.53	14.27	19.05	12.7	23.83	39.36	34.93	39.67	45.24
500	20"	508	6.35	9.53	12.7	9.53	15.09	20.62	12.7	26.19	32.54	38.1	44.45	50.01
550	22"	558.8	6.35	9.53	12.7	9.53		22.23	12.7	28.58	34.93	41.28	47.63	53.98
600	24"	609.6	6.35	9.53	14.27	9.53	17.48	24.61	12.7	30.96	38.89	46.02	52.37	59.54
650	26"	660.4	7.92	12.7		9.53			12.7
700	28"	711.2	7.92	12.7	15.88	9.53	-	-	12.7	-	-	-	-	-	-
750	30"	762	7.92	12.7	15.88	9.53	-	-	12.7	-	-	-	-	-	-
800	32"	812.8	7.92	12.7	15.88	9.53	17.48	-	12.7	-	-	-	-	-	-
850	34"	863.6	7.92	12.7	15.88	9.53	17.48	-	12.7	-	-	-	-	-	-
900	36"	914.4	7.92	12.7	15.88	9.53	19.05	-	12.7	-	-	-	-	-	-

Tolerances of carbon seamless steel pipe
Pipe types	Pipe sizes (mm)	Tolerances
Hot rolled	OD < 50	±0.50 mm
	OD ≥ 50	±1%
	WT < 4	±12.5%
	WT 4 ~ 20	+15%, -12.5%
	WT > 20	±12.5%
Cold drawn	OD 6 ~ 10	±0.20 mm
	OD 10 ~ 30	±0.40 mm
	OD 30 ~ 50	±0.45 mm
	OD > 50	±1%
	WT ≤ 1	±0.15 mm
	WT 1 ~ 3	+15%, -10%
	WT > 3	+12.5%, -10%

Material Properties

Chemical Composition
Tables list standard specified range of core elements: Carbon (C), Silicon (Si), Manganese (Mn), Sulfur (S), Phosphorus (P), each value strictly limited per corresponding material specification to guarantee steel purity and process stability.

Mechanical Performance
Test indicators include tensile strength, yield strength, elongation, hardness and impact toughness. Both room-temperature and low-temperature impact test data are available, all test values strictly follow the official requirement of matched pipe standards, differing from generic data without standard basis.

Standard	Grade	C	Si	Mn	P	S	Tensile Strength (MPa)	Yield Strength (MPa)
ASTM A53	A	≤0.25	-	≤0.95	≤0.05	≤0.06	≥330	≥205
ASTM A53	B	≤0.30	-	≤1.20	≤0.05	≤0.06	≥415	≥240
ASTM A106	A	≤0.30	≥0.10	0.29–1.06	≤0.035	≤0.035	≥415	≥240
ASTM A106	B	≤0.35	≥0.10	0.29–1.06	≤0.035	≤0.035	≥485	≥275
ASTM SA179	A179	0.06–0.18	-	0.27–0.63	≤0.035	≤0.035	≥325	≥180
ASTM SA192	A192	0.06–0.18	≤0.25	0.27–0.63	≤0.035	≤0.035	≥325	≥180
API 5L PSL1	A	0.22	-	0.9	0.03	0.03	≥331	≥207
API 5L PSL1	B	0.28	-	1.2	0.03	0.03	≥414	≥241
API 5L PSL1	X42	0.28	-	1.3	0.03	0.03	≥414	≥290
API 5L PSL1	X46	0.28	-	1.4	0.03	0.03	≥434	≥317
API 5L PSL1	X52	0.28	-	1.4	0.03	0.03	≥455	≥359
API 5L PSL1	X56	0.28	-	1.4	0.03	0.03	≥490	≥386
API 5L PSL1	X60	0.28	-	1.4	0.03	0.03	≥517	≥448
API 5L PSL1	X65	0.28	-	1.4	0.03	0.03	≥531	≥448
API 5L PSL1	X70	0.28	-	1.4	0.03	0.03	≥565	≥483
API 5L PSL2	B	0.24	-	1.2	0.025	0.015	≥414	≥241
API 5L PSL2	X42	0.24	-	1.3	0.025	0.015	≥414	≥290
API 5L PSL2	X46	0.24	-	1.4	0.025	0.015	≥434	≥317
API 5L PSL2	X52	0.24	-	1.4	0.025	0.015	≥455	≥359
API 5L PSL2	X56	0.24	-	1.4	0.025	0.015	≥490	≥386
API 5L PSL2	X60	0.24	-	1.4	0.025	0.015	≥517	≥414
API 5L PSL2	X65	0.24	-	1.4	0.025	0.015	≥531	≥448
API 5L PSL2	X70	0.24	-	1.4	0.025	0.015	≥565	≥483
API 5L PSL2	X80	0.24	-	1.4	0.025	0.015	≥621	≥552
GOST 8732 / GOST 8731	10	≤0.12	0.17–0.37	0.35–0.65	≤0.035	≤0.035	≥335	≥205
GOST 8732 / GOST 8731	20	0.17–0.24	0.17–0.37	0.35–0.65	≤0.035	≤0.035	≥410	≥245
GOST 8732 / GOST 8731	35	0.32–0.40	0.17–0.37	0.50–0.80	≤0.035	≤0.035	≥530	≥315
GOST 8732 / GOST 8731	45	0.42–0.50	0.17–0.37	0.50–0.80	≤0.035	≤0.035	≥600	≥355

Process & Finishing

Production of seamless steel pipe:
The process begins with solid steel rounds, or billets, being cut to a specified length and sent through a walking-beam reheat furnace, where temperatures reach nearly 2,300°F. After exiting the reheat furnace, the preheated rounds are turned into a tube shell in the rotary piercing mill as the billets are cross-rolled between two barrel-shaped rolls at a high speed. The seamless shells enter mandrel mill, where they are rolled over a retained mandrel to provide the needed OD size and wall thickness for the next process. The process is carefully monitored using a state-of-the-art hot-wall measuring system. The shells are then reheated for final forming in a 24-stand stretch-reducing mill, where outside diameters are formed to customers’ exacting specifications. Wall thickness is again verified using a hot-wall measuring system. After being rotated and advanced on the walking-beam cooling bed, the pipes are batch cut and transferred to an in-process storage area, where they are handled by computer-controlled gantry cranes.

Hot Rolled Process for Seamless Steel Pipe
Round Pipe Billet → Heating → Punching → Three-Roller Skew Rolling, Continuous Rolling or Extruding → Pipe Detaching →Micro Tension Sizing or Reducing → Cooling → Straightening → Hydrostatic Test or Inspection → Marking → Warehousing

Hot-Rolled-Process-for-Seamless-Steel-Pipe

Cold Drawn Process for Seamless Steel Pipe
Round Pipe Billet → Heating → Punching → Pipe Head Treatment → Annealing → Acid Pickling → Coating Oil → Multi-pass Cold Drawing → Pipe Billet → Heat Treatment → Straightening → Hydrostatic Test or Inspection → Marking → Warehousing
Cold-Drawn-Process-for-Seamless-Steel-Pipe

We equip full sets of machines to make hot rolled and cold drawn carbon seamless steel pipes.
Core production machines include steel billet heating furnace, rotary piercing mill, mandrel mill, stretch reducing mill, cold drawing machine, heat treatment furnace, straightener, cutting saw and full NDT inspection equipment.
All equipment strictly controls OD, wall thickness and mechanical performance during production. Supporting auxiliary machines handle pickling, phosphating, galvanizing, pipe end beveling and threading for customized finished pipes.

Production equipment of all process
Starting material	Piercing	Elongating expanding
Steel billets of various dimensions and grades, continuously cast or rolled	From the billet to the hollow	From the hollow to the shell
Billet preparation Billet saws Furnace technology Billet centering	Cross-rolling mills (cone type and barrel type piercing) Billet descaling 3-roll piercing mills Hollow inside deoxidation Cooling and quick-change systems for piercing tools	PQF® / MPM mill CPE/TPE mill / Push bench technology Assel mills, Plug mills, Hot pilger mills Elongators Rotary Expanders
Finish rolling	Finishing line	Products
From the shell to the tube	From the rolling mill to the dispatch area	Seamless tubes of various dimensions
Reheating furnace (gas fired/induction) High pressure water descaling unit Sizing mill, Stretch-reducing mill FPS adjustable rolling stands Tube layer saws	Groove dressing machines for PQF® cartridges Stretch-reducing and sizing mill stands	Diameters: 21.3 mm to 914.4 mm Wall thicknesses: 2.11 mm to 60 mm

Test & QC

Ultrasonic Inspection for Small-diameter Seamless Pipe
Ultrasonic inspection is in accordance with pulse-echo method using water gap method. Flow detection is performed by angle beam technique to date longitudinal and transverse flow on the inner and outer surface of pipe, and wall thickness measurement is performed by normal beam technique. The pipe, which is conveyed helically through the testing device, is inspected.

Electromagnetic Inspection for Large-diameter Seamless Pipe
Plug mill is equipped with an Amalog-Sonoscope, electromagnetic inspection units after heat treatment. The Amalog-Sonoscope pipe inspection system detects defects by using flux leakage by electromagnetic induction in search coil. Amalog magnetic circuits detect longitudinal defects in both the inside and outside surface. Sonoscope magnetic circuits detect circumferential defects.

Magnetic Particle Inspection
The tube is magnetized and provided with magnetic particles (mostly fluorescent magnetic particle). The presence of flaws creates a magnetic flux which shows changes in fluorescent brilliance under black light. The change is detected visually.

FAQ

Q1. What is carbon seamless steel pipe?

A1. Carbon seamless steel pipe is a hollow, joint-free structural steel tube manufactured via integral piercing and hot/cold forming. Compared with solid round steel, it features lighter weight and equal bending strength, making it a cost-effective structural steel material. Widely used for fluid transportation and mechanical component manufacturing, it is commonly applied in oil drilling, pipeline engineering, structural frames and industrial equipment fabrication with high stability and material utilization rate.

Q2. What are the other names and classification standards of seamless pipe?

A2. Carbon seamless steel pipe has multiple industry-standard trade names for global procurement and customs clearance, including Carbon Seamless Steel Pipe, CS SMLS Pipe, Black Seamless Pipe, MS Seamless Pipe and Fluid Seamless Pipe. It complies with mainstream global standards such as ASTM, GOST 8731/8732 and GB standards, covering ordinary black seamless pipe, precision bright pipe, boiler pipe and fluid pipe for different industrial scenarios.

Q3. What is the difference between hot rolled and cold drawn seamless pipe?

A3. Both types are fully seamless without welding seams, offering higher pressure resistance and structural integrity than welded pipes. Hot rolled (black) seamless pipes cover a complete size range, ideal for general fluid transmission, heating pipelines and conventional structural projects. Cold drawn (bright) seamless pipes feature smoother surface, tighter dimensional tolerance and higher precision, specially used for precision mechanical parts and high-precision engineering applications.

Q4. What steel grades are available and their applicable working conditions?

A4. We provide full-series carbon seamless steel grades matched with different temperature and pressure environments: 20# / CT20 for normal-temperature and low-pressure water, gas and heating pipelines; ASTM A106 Gr.B / A53 Gr.B for high-temperature and high-pressure boiler and oil & gas pipelines; ASTM A333 Gr.6 for low-temperature cryogenic projects; SA519 4140/4130 for professional mechanical structural components.

Q5. What are the main application industries of carbon seamless pipe?

A5. Carbon seamless steel pipes are widely used in diverse industrial fields, including water, gas and petroleum fluid transmission, high-pressure boiler and thermal engineering systems, mechanical processing and equipment manufacturing, steel structure engineering, as well as low-temperature petrochemical industrial projects.

Q6. What are the usage limitations of carbon seamless steel pipe?

A6. Conventional carbon seamless pipes are suitable for conventional fluid and structural working conditions. They are not applicable to strong corrosive media, highly toxic, flammable and explosive working environments. For extreme corrosive or special industrial conditions, surface anti-corrosion treatment or alloy steel pipes are recommended.

Q7. What customization, testing and export services do you provide?

A7. We support full custom processing including fixed-length cutting, beveling, threading, reducing, pickling, phosphating, galvanizing, anti-rust oil and painting. All products pass mandatory tensile, chemical, hydrostatic and flattening tests, with optional UT, eddy current and magnetic particle NDT inspection. Complete MTC, ISO9001 qualification, factory certificates and third-party SGS/BV reports are provided. We support flexible MOQ, sufficient stock, controllable lead time and standard export packaging for global delivery and GOST standard supply.

Dimensional Tolerance (per ASTM/DIN/GOST specs)
- OD tolerance: ±1% nominal outer diameter
- WT tolerance: +12.5% / -10% nominal wall thickness
- Length tolerance: ±0.5% standard cut length

Custom Machining Available
Custom fixed-length cutting, end beveling, diameter reducing, threading & other tailored dimensional processing are supported to match project installation demands.

NOMINAL PIPE SIZE		OD (mm)	NOMINAL WALL THICKNESS
DN	NB(inch)	ASME	SCH10	SCH20	SCH30	STD	SCH40	SCH60	XS	SCH80	SCH100	SCH120	SCH140	SCH160	XXS
15	1/2"	21.3	2.11		2.41	2.77	2.77		3.73	3.73				4.78	7.47
20	3/4"	26.7	2.11		2.41	2.87	2.87		3.91	3.91				5.56	7.82
25	1"	33.4	2.77		2.9	3.38	3.38		4.55	4.55				6.35	9.09
32	1-1/4"	42.2	2.77		2.97	3.56	3.56		4.85	4.85				6.35	9.7
40	1-1/2"	48.3	2.77		3.18	3.68	3.68		5.08	5.08				7.14	10.15
50	2"	60.3	2.77		3.18	3.91	3.91		5.54	5.54				8.74	11.07
65	2-1/2"	73	3.05		4.78	5.16	5.16		7.01	7.01				9.53	14.02
80	3"	88.9	3.05		4.78	5.49	5.49		7.62	7.62				11.13	15.25
90	3-1/2"	101.6	3.05		4.78	5.74	5.74		8.08	8.08
100	4"	114.3	3.05		4.78	6.02	6.02		8.56	8.56		11.13		13.49	17.12
125	5"	141.3	3.4			6.55	6.55		9.53	9.53		12.7		15.88	19.05
150	6"	168.3	3.4			7.11	7.11		10.97	10.97		14.27		18.26	21.95
200	8"	219.1	3.76	6.35	7.04	8.18	8.18	10.31	12.7	12.7	15.09	18.26	20.62	23.01	22.23
250	10"	273	4.19	6.35	7.8	9.27	9.27	12.7	12.7	15.09	18.26	21.44	25.4	28.58	25.4
300	12"	323.8	4.57	6.35	8.38	9.53	10.31	14.27	12.7	17.48	21.44	25.4	28.58	33.32	25.4
350	14"	355.6	6.35	7.92	9.53	9.53	11.13	15.09	12.7	19.05	23.83	27.79	31.75	35.71
400	16"	406.4	6.35	7.92	9.53	9.53	12.7	16.66	12.7	21.44	26.19	30.96	36.53	40.19
450	18"	457.2	6.35	7.92	11.13	9.53	14.27	19.05	12.7	23.83	39.36	34.93	39.67	45.24
500	20"	508	6.35	9.53	12.7	9.53	15.09	20.62	12.7	26.19	32.54	38.1	44.45	50.01
550	22"	558.8	6.35	9.53	12.7	9.53		22.23	12.7	28.58	34.93	41.28	47.63	53.98
600	24"	609.6	6.35	9.53	14.27	9.53	17.48	24.61	12.7	30.96	38.89	46.02	52.37	59.54
650	26"	660.4	7.92	12.7		9.53			12.7
700	28"	711.2	7.92	12.7	15.88	9.53	-	-	12.7	-	-	-	-	-	-
750	30"	762	7.92	12.7	15.88	9.53	-	-	12.7	-	-	-	-	-	-
800	32"	812.8	7.92	12.7	15.88	9.53	17.48	-	12.7	-	-	-	-	-	-
850	34"	863.6	7.92	12.7	15.88	9.53	17.48	-	12.7	-	-	-	-	-	-
900	36"	914.4	7.92	12.7	15.88	9.53	19.05	-	12.7	-	-	-	-	-	-

Tolerances of carbon seamless steel pipe
Pipe types	Pipe sizes (mm)	Tolerances
Hot rolled	OD < 50	±0.50 mm
	OD ≥ 50	±1%
	WT < 4	±12.5%
	WT 4 ~ 20	+15%, -12.5%
	WT > 20	±12.5%
Cold drawn	OD 6 ~ 10	±0.20 mm
	OD 10 ~ 30	±0.40 mm
	OD 30 ~ 50	±0.45 mm
	OD > 50	±1%
	WT ≤ 1	±0.15 mm
	WT 1 ~ 3	+15%, -10%
	WT > 3	+12.5%, -10%

Standard	Grade	C	Si	Mn	P	S	Tensile Strength (MPa)	Yield Strength (MPa)
ASTM A53	A	≤0.25	-	≤0.95	≤0.05	≤0.06	≥330	≥205
ASTM A53	B	≤0.30	-	≤1.20	≤0.05	≤0.06	≥415	≥240
ASTM A106	A	≤0.30	≥0.10	0.29–1.06	≤0.035	≤0.035	≥415	≥240
ASTM A106	B	≤0.35	≥0.10	0.29–1.06	≤0.035	≤0.035	≥485	≥275
ASTM SA179	A179	0.06–0.18	-	0.27–0.63	≤0.035	≤0.035	≥325	≥180
ASTM SA192	A192	0.06–0.18	≤0.25	0.27–0.63	≤0.035	≤0.035	≥325	≥180
API 5L PSL1	A	0.22	-	0.9	0.03	0.03	≥331	≥207
API 5L PSL1	B	0.28	-	1.2	0.03	0.03	≥414	≥241
API 5L PSL1	X42	0.28	-	1.3	0.03	0.03	≥414	≥290
API 5L PSL1	X46	0.28	-	1.4	0.03	0.03	≥434	≥317
API 5L PSL1	X52	0.28	-	1.4	0.03	0.03	≥455	≥359
API 5L PSL1	X56	0.28	-	1.4	0.03	0.03	≥490	≥386
API 5L PSL1	X60	0.28	-	1.4	0.03	0.03	≥517	≥448
API 5L PSL1	X65	0.28	-	1.4	0.03	0.03	≥531	≥448
API 5L PSL1	X70	0.28	-	1.4	0.03	0.03	≥565	≥483
API 5L PSL2	B	0.24	-	1.2	0.025	0.015	≥414	≥241
API 5L PSL2	X42	0.24	-	1.3	0.025	0.015	≥414	≥290
API 5L PSL2	X46	0.24	-	1.4	0.025	0.015	≥434	≥317
API 5L PSL2	X52	0.24	-	1.4	0.025	0.015	≥455	≥359
API 5L PSL2	X56	0.24	-	1.4	0.025	0.015	≥490	≥386
API 5L PSL2	X60	0.24	-	1.4	0.025	0.015	≥517	≥414
API 5L PSL2	X65	0.24	-	1.4	0.025	0.015	≥531	≥448
API 5L PSL2	X70	0.24	-	1.4	0.025	0.015	≥565	≥483
API 5L PSL2	X80	0.24	-	1.4	0.025	0.015	≥621	≥552
GOST 8732 / GOST 8731	10	≤0.12	0.17–0.37	0.35–0.65	≤0.035	≤0.035	≥335	≥205
GOST 8732 / GOST 8731	20	0.17–0.24	0.17–0.37	0.35–0.65	≤0.035	≤0.035	≥410	≥245
GOST 8732 / GOST 8731	35	0.32–0.40	0.17–0.37	0.50–0.80	≤0.035	≤0.035	≥530	≥315
GOST 8732 / GOST 8731	45	0.42–0.50	0.17–0.37	0.50–0.80	≤0.035	≤0.035	≥600	≥355

Hot-Rolled-Process-for-Seamless-Steel-Pipe

Production equipment of all process
Starting material	Piercing	Elongating expanding
Steel billets of various dimensions and grades, continuously cast or rolled	From the billet to the hollow	From the hollow to the shell
Billet preparation Billet saws Furnace technology Billet centering	Cross-rolling mills (cone type and barrel type piercing) Billet descaling 3-roll piercing mills Hollow inside deoxidation Cooling and quick-change systems for piercing tools	PQF® / MPM mill CPE/TPE mill / Push bench technology Assel mills, Plug mills, Hot pilger mills Elongators Rotary Expanders
Finish rolling	Finishing line	Products
From the shell to the tube	From the rolling mill to the dispatch area	Seamless tubes of various dimensions
Reheating furnace (gas fired/induction) High pressure water descaling unit Sizing mill, Stretch-reducing mill FPS adjustable rolling stands Tube layer saws	Groove dressing machines for PQF® cartridges Stretch-reducing and sizing mill stands	Diameters: 21.3 mm to 914.4 mm Wall thicknesses: 2.11 mm to 60 mm

Q1. What is carbon seamless steel pipe?

Q2. What are the other names and classification standards of seamless pipe?

Q3. What is the difference between hot rolled and cold drawn seamless pipe?

Q4. What steel grades are available and their applicable working conditions?

Q5. What are the main application industries of carbon seamless pipe?

Q6. What are the usage limitations of carbon seamless steel pipe?

Q7. What customization, testing and export services do you provide?

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