Seamless steel pipes oil cracking

standards:
GB9948 - China National Institute of Standards

use:
for the oil refinery furnace tubes, heat exchanger tubes and pipes used seamless steel pipe.

produce steel grades:
10,20,15 CrMo, 1Cr2Mo, 1Cr5Mo, etc.

Tolerance:

steel types	diameter (D)		pipe wall thickness (S)
tube cold-drawing	pipe outside diameter (mm)	allow deviation (mm)	pipe wall thickness (mm)	allow deviation (mm)
	> 30 ~ 50	± 0.3	≤ 30	± 10%
	> 50 ~ 219	± 0.8%

mechanical properties:

standards	Grade	tensile strength (MPa)	yield strength (MPa)	elongation (%)	impact energy (J)	Brinell hardness (HB)	delivery state of
GB9948	10	330 ~ 490	≥ 205	≥ 24	/	/	normalizing
	20	410 ~ 550	≥ 245	≥ 21	≥ 39	/	normalizing
	15CrMo	440 ~ 640	≥ 235	≥ 21	≥ 47	≤ 170	normalizing tempering plus
	1Cr2Mo	≥ 390	≥ 175	≥ 22	≥ 92	≤ 179	normalizing tempering plus
	1Cr5Mo	≥ 390	≥ 195	≥ 22	≥ 92	≤ 187	annealing

chemical composition:

standards	Grade	chemical composition (%)
standards	Grade	C	Si	Mn	P	S	Cr	Mo	Ni
GB9948	10	0.07 ~ 0.14	0.17 ~ 0.37	0.35 ~ 0.65	≤ 0.035	≤ 0.035	≤ 0.15	/	≤ 0.25
	20	0.17 ~ 0.24	0.17 ~ 0.37	0.35 ~ 0.65	≤ 0.035	≤ 0.035	≤ 0.25	/	≤ 0.25
	15CrMo	0.12 ~ 0.18	0.17 ~ 0.37	0.40 ~ 0.70	≤ 0.035	≤ 0.035	0.80 ~ 1.10	0.40 ~ 0.55	≤ 0.30
	1Cr2Mo	≤ 0.15	0.50 ~ 1.00	0.30 ~ 0.60	≤ 0.035	≤ 0.030	2.15 ~ 2.85	0.45 ~ 0.65	/
	1Cr5Mo	≤ 0.15	≤ 0.50	≤ 0.60	≤ 0.035	≤ 0.030	4.00 ~ 6.00	0.45 ~ 0.60	≤ 0.60

steel specifications:

oil cracking tube
Material: 20A (GB9948-88)			Material: 20A (GB9948-88)			Material: 20A (GB9948-88)			Material: 20A (GB9948-88)
specifications	number (t)	origin	specifications	number (t)	origin	specifications	number (t)	origin	specifications	number (t)	origin
18 * 3	24	factory	60 * 8	18	factory	133 * 14	16	factory	273 * 9.5	55	Chengdu
18 * 4	16	factory	60 * 9	14	factory	140 * 8	18	factory	273 * 10	27	Chengdu
22 * 3	38	factory	60 * 10	26	factory	140 * 9	20	factory	273 * 11	24	Chengdu
22 * 4	7	factory	76 * 5	7	factory	152 * 7	24	Chengdu	273 * 12	19	Chengdu
22 * 5	15	factory	76 * 6	27	factory	152 * 8	14	Chengdu	273 * 13	34	Chengdu
25 * 3	20	factory	76 * 7	33	factory	152 * 9	23	Chengdu	273 * 14	18	Chengdu
25 * 3.5	16	factory	76 * 8	19	factory	152 * 10	7	Chengdu	273 * 15	19	Chengdu
25 * 4	34	factory	76 * 10	24	factory	159 * 6	25	Chengdu	273 * 16	74	Chengdu
25 * 4.5	21	factory	89 * 4	20	factory	159 * 6.5	31	Chengdu	273 * 18	43	Chengdu
27 * 4	13	factory	89 * 4.5	17	factory	159 * 7	33	Chengdu	273 * 20	21	Chengdu
27 * 5	42	factory	89 * 5	26	factory	159 * 8	24	Chengdu	273 * 22	9	Chengdu
27 * 5.5	30	factory	89 * 6	33	factory	159 * 8.5	19	Chengdu	273 * 25	20	Chengdu
32 * 3.5	25	factory	89 * 6	26	factory	159 * 10	55	Chengdu	325 * 8.5	32	Chengdu
32 * 4	54	factory	89 * 6.5	15	factory	159 * 11	14	Chengdu	325 * 9	54	Chengdu
32 * 4.5	26	factory	89 * 7	7	factory	159 * 12	9	Chengdu	325 * 9.5	35	Chengdu
32 * 5	38	factory	89 * 7.5	27	factory	159 * 14	38	Chengdu	325 * 10	43	Chengdu
34 * 3	22	factory	89 * 8	28	factory	159 * 16	19	Chengdu	325 * 12	30	Chengdu
34 * 4	7	factory	89 * 9	49	factory	159 * 18	43	Chengdu	325 * 13	21	Chengdu
34 * 4.5	15	factory	89 * 10	31	factory	168 * 6	20	Chengdu	325 * 15	32	Chengdu
34 * 5	34	factory	89 * 11	24	factory	168 * 7	16	Chengdu	325 * 16	19	Chengdu
34 * 6.5	18	factory	89 * 12	2	factory	168 * 8	27	Chengdu	325 * 17	45	Chengdu
38 * 3	16	factory	89 * 14	25	factory	168 * 9	23	Chengdu	325 * 18	34	Chengdu
38 * 4	34	factory	102 * 8	28	factory	168 * 9.5	42	Chengdu	325 * 22	17	Chengdu
38 * 5	25	factory	108 * 6	26	factory	168 * 10	56	Chengdu	325 * 25	19	Chengdu
45 * 4	20	factory	108 * 7	42	factory	168 * 11	35	Chengdu	356 * 9.5	20	Chengdu
45 * 5	19	factory	108 * 8	23	factory	168 * 12	24	Chengdu	356 * 11	42	Chengdu
48 * 3.5	27	factory	108 * 9	20	factory	168 * 14	37	Chengdu	356 * 15	35	Chengdu
48 * 4	33	factory	108 * 10	45	factory	168 * 15	31	Chengdu	356 * 19	16	Chengdu
48 * 4.5	26	factory	108 * 12	299	factory	168 * 16	20	Chengdu	356 * 28	43	Chengdu
48 * 5	22	factory	114 * 5	14	factory	168 * 18	7	Chengdu	356 * 28	43	Chengdu
48 * 6	52	factory	114 * 5.5	38	factory	168 * 20	43	Chengdu	377 * 9.5	27	Chengdu
48 * 7	30	factory	114 * 6	20	factory	219 * 7	27	Chengdu	377 * 10	25	Chengdu
51 * 5	23	factory	114 * 8	19	factory	219 * 8	56	Chengdu	377 * 11	40	Chengdu
51 * 6	34	factory	114 * 8.5	16	factory	219 * 10	54	Chengdu	377 * 14	21	Chengdu
57 * 4	20	factory	114 * 9	34	factory	219 * 12	25	Chengdu	377 * 15	7	Chengdu
57 * 5	45	factory	114 * 10	7	factory	219 * 13	44	Chengdu	377 * 16	28	Chengdu
57 * 5.5	7	factory	114 * 11	28	factory	219 * 14	20	Chengdu	377 * 25	30	Chengdu
57 * 6	18	factory	114 * 12	42	factory	219 * 15	39	Chengdu	406 * 9.5	25	Chengdu
60 * 4	25	factory	114 * 12.5	20	factory	219 * 16	42	Chengdu	406 * 13	34	Chengdu
60.45	15	factory	114 * 14	25	factory	219 * 18	29	Chengdu	406 * 17	26	Chengdu
60 * 5	23	factory	127 * 8	20	factory	219 * 20	17	Chengdu	406 * 26	7	Chengdu
60 * 5.5	25	factory	127 * 10	24	factory	219 * 25	14	Chengdu	406 * 32	20	Chengdu
60 * 6	21	factory	133 * 10	27	factory	273 * 8	28	Chengdu	426 * 10	33	Chengdu
60 * 7	20	factory	133 * 12	41	factory	273 * 9	36	Chengdu	426 * 13	24	Chengdu

performance parameters

straightforward LSAW pipe diameter up to Φ 406.4- Φ 1422.4mm < / span>
up to a maximum of steel 12.2m < / span> , in × 70 grade steel wall for the 6.4 -26.4mm

Seamless steel pipes oil cracking

Instruction: