Introduction - Hunan Panjin Pipe Industry Co.,Ltd

about us

Hunan Panjin Pipe Industry Co.,Ltd.

Hunan Panjin Pipe Industry Co., Ltd. is a professional manufacturer of seamless steel pipes, committed to supplying reliable tubular solutions for energy, engineering, and industrial applications worldwide.

Backed by solid manufacturing capability and strict quality control systems, Panjin Pipe integrates raw material selection, hot rolling, heat treatment, finishing, inspection, and logistics into a complete and controllable production chain. Our products are widely used in oil & gas, petrochemical, boiler & heat exchanger, mechanical structure, and construction engineering sectors.

Products & Standards

Our seamless steel pipes are manufactured in accordance with major international standards, including but not limited to ASTM / ASME, API, EN, DIN, GOST.

Typical steel grades include carbon steel, alloy steel, and special-purpose grades.

Common production size range:

Outer Diameter (inch)	Inner Diameter (inch)	Outer Diameter (mm)	SCH20	SCH30	SCH40	SCH 80	SCH 100	SCH 120	SCH 140	SCH 160
0.25	DN8	13.7	-	-	2.24	3.02				-
0.375	DN10	17.1	-	-	2.31	3.2				-
0.5	DN15	21.3			2.77	3.73				4.78
0.75	DN20	26.7			2.87	3.91				5.56
1	DN25	33.4			3.38	4.55				6.35
1.25	DN32	42.2			3.56	4.85				6.35
1.5	DN40	48.3			3.68	5.08				7.14
2	DN50	60.3			3.91	5.54				8.74
2.5	DN65	73			5.16	7.01				9.53
3	DN80	88.9			5.49	7.62				11.13
3.5	DN100	101.6			5.74	8.08
4	DN100	114.3			6.02	8.58		11.13		13.49
5	DN125	141.3			6.55	9.53		12.7		15.88
6	DN150	168.3			7.11	10.97		14.27		18.26
8	DN200	219.1	6.35	7.04	8.18	12.70	15.09	18.26	20.26	23.01
10	DN250	273.1	6.5	7.8	9.27	15.09	18.26	21.44	25.4	28.58
12	DN300	323.9	7	9.53	10.31	17.48	21.44	25.4	28.58	33.32
14	DN350	355.6	7.92(8)		11.13	19.05	23.83	27.79	31.75	35.71
16	DN400	406.4	7.92(8)	9.53	12.70	21.44	26.19	30.96	36.53	40.49
18	DN450	457	7.92(8)	11.13	14.27	23.83	29.36	34.93	39.67	45.24
20	DN500	508	9.53	12.70	15.09	26.19	32.54	38.1	44.45	50.01
24	DN600	610	9.53	14.27	17.48	30.96	38.89	46.02	52.37	59.54

Manufacturing & Quality Assurance

High-Temperature Laboratory Furnace

Used for heat treatment simulation and metallurgical analysis support.

Bend Testing Machine

Used for bend testing to evaluate ductility and forming performance of steel pipes.

High-Temperature Tensile Testing System

Used to evaluate tensile properties of steel materials under elevated temperature conditions.

Charpy Impact Testing Machine

Used to evaluate impact toughness and low-temperature performance of seamless steel pipes under dynamic loading conditions.

Universal Tensile Testing Machine

Used to determine yield strength, tensile strength, and elongation of seamless steel pipes, ensuring compliance with international mechanical property requirements.