Black steel pipe

We can produce and supply to you various steel pipes according to international standard. Black steel pipes are used in the following fields, steel structure, build structure, transportation of low pression liquid and gas etc. our products are exported to about 50 countries in the world, we get a lot of recognition from many customers since our good quality and service.

Production standard: ASTM, JIS, BS, DIN, EN, API, GB

Section type: round, square, rectangular, oval and other special section type.

ASTM A-53

NPS DESIG- NATOR	OUTSIDE DIAMETER		WALL THICKNESS		WEIGHT				SCHE- DULE NO.	TEST PRESSUTES				NO.OF THREADS PER INCH
					PLAIN ENDS
					Kg/m		Kg/ft			Grade A		Grade B
in	in	mm	in	mm	blk	gal	blk	gal		psi	Kg/cm2	psi	Kg/cm2
1/2	0.840	21.3	0.109	2.77	1.27	1.35	0.39	0.41	40	700	50	700	50	14
3/4	1.050	26.7	0.113	2.87	1.69	1.79	0.52	0.55	40	700	50	700	50	14
1	1.315	33.4	0.133	3.38	2.50	2.65	0.76	0.81	40	700	50	700	50	11-1/2
1-1/4	1.660	42.2	0.140	3.56	3.39	3.59	1.03	1.10	40	1200	84	1300	91	11-1/2
1-1/2	1.900	48.3	0.145	3.68	4.05	4.29	1.23	1.31	40	1200	84	1300	91	11-1/2
2	2.375	60.3	0.154	3.91	5.44	5.77	1.66	1.76	40	2300	162	2500	176	11-1/2
2-1/2	2.875	73.0	0.203	5.16	8.63	9.15	2.63	2.79	40	2500	176	2500	176	8
3	3.500	88.9	0.216	5.49	11.29	11.97	3.44	3.65	40	2220	156	2500	176	8
3-1/2	4.000	101.6	0.226	5.74	13.57	14.38	4.14	4.38	40	2030	143	2370	167	8
4	4.500	114.3	0.237	6.02	16.07	17.03	4.90	5.19	40	1900	134	2210	155	8
5	5.563	141.3	0.258	6.55	21.77	23.08	6.64	7.03	40	1670	117	1950	137	8
6	6.625	168.3	0.280	7.11	28.26	29.96	8.61	9.13	40	1520	107	1780	125	8
8	8.625	219.1	0.322	8.18	42.55	45.10	12.97	13.75	40	1340	94	1570	110	8

 

British Standard (BS1387-85) Thin thickness pipe specification

		Outside Diameter(mm)			Weight of Black Pipe(kg/m)
Nominal Size (DN)	Screw Identifiers	Maximum	Minimum	Thickness	Plain end pipe	Threaded and With Coupler
15	1/2	21.4	21.0	2.0	0.947	0.956
20	3/4	26.9	26.4	2.3	1.38	1.39
25	1	33.8	33.2	2.6	1.98	2.00
32	11/4	42.5	41.9	2.6	2.54	2.57
40	11/2	48.4	47.8	2.9	3.23	3.27
50	2	60.2	59.6	2.9	4.08	4.15
65	21/2	76.0	75.2	3.2	5.71	5.83
80	3	88.7	87.9	3.2	6.72	6.89
100	4	113.9	113.0	3.6	9.75	10.0

Note: Size and weight are as same as ISO 65 (Thin thickness 2).

 

Normal steel pipe size

		Outside Diameter(mm)			Weight of Black Pipe(kg/m)
Nominal Size (DN)	Screw Identifiers	Maximum	Minimum	Thickness	Plain end pipe	Threaded and With Coupler
15	1/2	21.7	21.1	2.6	1.21	1.22
20	3/4	27.2	26.6	2.6	1.56	1.57
25	1	34.2	33.4	3.2	2.41	2.43
32	11/4	42.9	42.1	3.2	3.10	3.13
40	11/2	48.8	48.0	3.2	3.57	3.61
50	2	60.8	59.8	3.6	5.03	5.10
65	21/2	76.6	75.4	3.6	6.43	6.55
80	3	89.5	88.1	4.0	8.37	8.54
100	4	114.9	113.3	4.5	12.2	12.5
125	5	140.6	138.7	5.0	16.6	17.1
150	6	166.1	164.1	5.0	19.7	20.3

 

Deutsche Industrie Normen (DIN2444) Hot Dipped Galvanized Pipe and Welded Black Pipe

Nominal Inside Diameter		Outside Diameter (mm)		Wall Thickness	Weight(kg/m)
DN	inch	Maximum	Minimum	( mm)	Plain End Pipe	Pipe With Coupler
15	1/2	21.7	21.1	2.65	1.22	1.23
20	3/4	27.2	26.6	2.65	1.58	1.59
25	1	34.2	33.4	3.25	2.44	2.46
32	1-1/4	42.9	42.1	3.25	3.14	3.17
40	1-1/2	48.8	48.0	3.25	3.61	3.65
50	2	60.7	59.9	3.65	5.10	5.17
65	2-1/2	76.4	75.6	3.65	6.51	6.63
80	3	89.3	88.3	4.05	8.47	8.64
100	4	114.6	113.6	4.50	12.10	12.40
125	5	140.3	139.1	4.85	16.20	16.70
150	6	165.7	164.5	4.85	19.20	19.80

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