Name: low carbon steel pipe
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low carbon steel pipe

Main Application Areas

Building and Structures: Scaffolding pipes, steel structural frames for buildings (e.g., factories, stadiums), railings, door and window frames. Typically uses welded pipes conforming to ASTM A500 or EN 10219 standards.

Low-Pressure Fluid Transportation: Water and gas pipes, HVAC system piping, fire sprinkler systems. Commonly uses ASTM A53 welded pipes, which are then galvanized to become common galvanized steel pipes.

Infrastructure: Municipal water supply and drainage pipelines, low-pressure gas pipelines for residential use.

Machinery Manufacturing and Vehicles: Agricultural machinery frames, automotive exhaust systems (partial), furniture structural components, general mechanical parts.

Oil and Gas: Low-pressure gathering and transmission pipelines, oil well surface casing.

Material	(Carbon Steel Pipe) Low carbon and medium carbon steel
Type	Seamless (SMLS) ,Straight seam,Spiral welding
Size Range	O.D. : 1/2" to 24" (DN15 to DN600) W.T. : SCH 10, 20, 40, 80, 160, XXS
Length	6m, 12m, or Custom Cut (up to 18m)
Process	Hot-Rolled / Cold-Drawn/welding
Ends	Plain Ends (PE), Beveled Ends (BE), Threaded (THD), Spherical Socket End
Surface	Black, Varnished, Galvanized (Optional)
Standards	ASTM A106, ASTM A53, API 5L, ASME B36.10, DIN 2448
MOQ	1ton
Packaging	Bundled with Steel Strips, Plastic Caps on Ends, Waterproof Wrapping

Classification of Carbon Steel Pipes by Carbon Content

Classification	Carbon Content (C)	Key Characteristics	Common Standards/Grades	Typical Applications
Low Carbon Steel Pipe	≤ 0.25%	Good plasticity and toughness, easy to weld.	API 5L A/B, ASTM A53 Gr.A/B, EN 10210 S235, Q195, Q235	Building structures, low-pressure fluid conveyance.
Medium Carbon Steel Pipe	0.25% < C ≤ 0.60%	Higher strength and hardness; properties can be enhanced by heat treatment.	API 5CT N80, ASTM A106 Gr.B, Grade 45# steel	Mechanical parts, shafts, petroleum casing.
High Carbon Steel Pipe	> 0.60% (Less common for pipes)	High hardness and wear resistance, high brittleness.	(Specific tool steel grades)	Special tools, wear-resistant components.

Classification and Comparison of Carbon Steel Pipes by Manufacturing Process

Manufacturing Process		Key Characteristics	Primary Methods	Typical Standards	Main Applications / Notes
Seamless Carbon Steel Pipe		No weld seam, uniform pressure-bearing capability, highest reliability.	Hot Rolling & Piercing, Cold Drawing / Cold Rolling.	API 5CT (Casing/Tubing), ASTM A106 (High-Temp Service), ASTM A179 (Heat Exchanger Tubes).	Oil & gas well casing, high-temperature/pressure piping systems, heat exchangers.
Welded Carbon Steel Pipe	Longitudinal (LSAW/SAWL)	Contains a weld seam, high production efficiency, lower cost.	Longitudinal seam welding.	API 5L, EN 10217.	Large-diameter, thick-wall, high-pressure pipelines (e.g., main oil/gas transmission lines).
	Spiral (SSAW/SAWH)		Spiral (helical) seam welding.	API 5L, ASTM A139.	Large-diameter, low-pressure conveyance (e.g., water mains, piling pipes).
	Resistance (ERW/HFW)		Electric Resistance / High-Frequency Welding.	API 5L, ASTM A53, ASTM A500.	Medium/small-diameter fluid pipes, structural tubes (e.g., API line pipe, scaffolding).

Selection Recommendation

For maximum reliability and resistance to high pressure and temperature: seamless steel pipes are preferred (e.g., boiler tubes, high-pressure chemical pipelines).

For large-diameter, long-distance transportation: straight-seam submerged arc welded pipes are preferred (e.g., oil and gas trunk pipelines).

For general low-pressure fluid transportation and structural applications: ERW welded pipes or spiral welded pipes can be used (e.g., construction scaffolding, water supply pipes).

For cost-sensitive applications and general operating conditions: spiral welded pipes can be considered.

Details of the chemical composition of main carbon steel pipes

Application Category	Standard	Grade / Designation	C (Carbon)	Mn (Manganese)	P (Phosphorus)	S (Sulfur)	Si (Silicon)	Others / Key Notes
Line Pipe (Oil & Gas Transmission)	API 5L PSL1	B	≤0.22%	≤1.20%	≤0.025%	≤0.015%	≤0.45%	Cu, Ni, Cr, Mo ≤0.50% (each)
	API 5L PSL2	X52	≤0.22%	≤1.40%	≤0.025%	≤0.015%	≤0.45%	Microalloying with Nb, V, Ti may be used.
	API 5L PSL2	X65	≤0.22%	≤1.60%	≤0.025%	≤0.015%	≤0.45%	Nb, V, Ti controlled for high strength.
Oil Country Tubular Goods (OCTG)	API 5CT	J55	≤0.43%	≤1.90%	≤0.030%	≤0.030%	≤0.45%	—
		N80 (Type 1)	≤0.43%	≤1.90%	≤0.030%	≤0.030%	≤0.45%	—
		P110	≤0.35%	≤1.80%	≤0.030%	≤0.030%	≤0.45%	Quenched & Tempered
General Low-Pressure Fluid & Structural Conveyance	ASTM A53	Gr. B (ERW/Seamless)	≤0.30%	≤1.20%	≤0.050%	≤0.045%	—	—
General Low-Pressure Fluid & Structural Conveyance	ASTM A500	Gr. C (Structural)	≤0.23%	≤1.35%	≤0.035%	≤0.035%	—	Cu ≥0.20% when specified.
Boiler & Heat Exchanger Tubes	ASTM A106	Gr. B (Seamless)	≤0.30%	0.29-1.06%	≤0.035%	≤0.035%	≥0.10%	Cu, Ni, Cr, Mo ≤0.40% (each)
Boiler & Heat Exchanger Tubes	ASTM A192	—	≤0.12-0.20%	0.27-0.63%	≤0.025%	≤0.025%	≤0.10%	For high-pressure boilers, low C for weldability.
Building & Construction Structural Tubing	EN 10210-1	S355J2H	≤0.22%	≤1.60%	≤0.030%	≤0.030%	≤0.55%	CEV (Carbon Equivalent) limit for weldability.
Building & Construction Structural Tubing	ASTM A500	Gr. D (Cold Formed)	≤0.23%	≤1.40%	≤0.035%	≤0.035%	—	Minimum yield 360 MPa (52 ksi).
Mechanical & Precision Tubing	DIN 2391	St52.0	≤0.22%	1.00-1.50%	≤0.040%	≤0.040%	—	Cold drawn seamless, for cylinders & parts.
Mechanical & Precision Tubing	ASTM A519	1020	0.18-0.23%	0.30-0.60%	≤0.040%	≤0.050%	—	Standard mechanical grade for machining.
High-Pressure Service Pipes	EN 10216-2	P355GH	≤0.20%	≤1.40%	≤0.025%	≤0.020%	0.20-0.55%	Normalized, for pressure vessels & piping.
High-Pressure Service Pipes	ASTM A333	Gr. 6 (Low Temp)	≤0.30%	0.29-1.06%	≤0.025%	≤0.025%	≥0.10%	For low temperature service down to -45°C.

Product Dimensions

NPS	(OD)	Schedule 40（thickness ）	Schedule 80（thickness ）
	in (mm)	in (mm)	thickness in (mm)
1/8	0.405 (10.29)	0.068 (1.73)	0.095 (2.41)
1/4	0.540 (13.72)	0.088 (2.24)	0.119 (3.02)
3/8	0.675 (17.15)	0.091 (2.31)	0.126 (3.20)
1/2	0.840 (21.34)	0.109 (2.77)	0.147 (3.73)
3/4	1.050 (26.67)	0.113 (2.87)	0.154 (3.91)
1	1.315 (33.40)	0.133 (3.38)	0.179 (4.55)
1 1/4	1.660 (42.16)	0.140 (3.56)	0.191 (4.85)
1 1/2	1.900 (48.26)	0.145 (3.68)	0.200 (5.08)
2	2.375 (60.33)	0.154 (3.91)	0.218 (5.54)
2 1/2	2.875 (73.03)	0.203 (5.16)	0.276 (7.01)
3	3.500 (88.90)	0.216 (5.49)	0.300 (7.62)
3 1/2	4.000 (101.60)	0.226 (5.74)	0.318 (8.08)
4	4.500 (114.30)	0.237 (6.02)	0.337 (8.56)
5	5.563 (141.30)	0.258 (6.55)	0.375 (9.53)
6	6.625 (168.28)	0.280 (7.11)	0.432 (10.97)
8	8.625 (219.08)	0.322 (8.18)	0.500 (12.70)
10	10.750 (273.05)	0.365 (9.27)	0.500 (12.70)*
12	12.750 (323.85)	0.375 (9.53)	0.500 (12.70)*
14	14.000 (355.60)	0.375 (9.53)	0.500 (12.70)*
16	16.000 (406.40)	0.375 (9.53)	0.500 (12.70)*
18	18.000 (457.20)	0.375 (9.53)	0.500 (12.70)*
20	20.000 (508.00)	0.375 (9.53)	0.500 (12.70)*
24	24.000 (609.60)	0.375 (9.53)	0.500 (12.70)*

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Shandong Zhonglian Yongsheng Special Steel Co., Ltd. is a steel production enterprise that has been engaged in steel production, processing and sales for many years. Its main products include stainless steel series, carbon steel, galvanized steel and other profile products. It can also provide other metal products according to customer needs, with an annual export volume of about 1 million tons. It has five finishing production lines, three hot-dip galvanizing production lines, and two color coating production lines. It adopts advanced automatic width control system (AWC), automatic thickness control system (AGC), bending roll system, work roll guide roll system and other effective measures to ensure product quality. Its products are exported to more than 30 countries and regions including the United States, Canada, Spain, Russia, Iran, Saudi Arabia, Morocco, India, Pakistan, Malaysia, Singapore, Australia, New Zealand, etc. "Punctuality, integrity, and humanized service" have always been the development principles that the company and all employees have always adhered to.

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