High-quality hot rolled seamless steel pipe for durable industrial applications.

Hot Rolled Seamless Steel Pipe

Hot rolled seamless steel pipe is manufactured through a hot rolling process, resulting in a robust and durable pipe with no welded seams, suitable for high-pressure applications and harsh environments.

Introduction to hot rolled seamless steel pipe:

Hot rolled seamless steel pipe is a kind of seamless steel pipe, and its classification is based on the production method. Hot rolling and cold rolling are two different processes. Cold rolling is a rolling process carried out at room temperature, while hot rolling is carried out above the recrystallization temperature of the metal. Seamless steel pipe as opposed to welded steel pipe, the former is usually made by perforating round steel and then processing it, while the latter is made from steel plates by different welding methods.

Hot rolled seamless steel pipe classification:

It mainly includes ordinary steel pipe, low and medium pressure boiler pipe, high pressure boiler pipe, alloy pipe, stainless steel pipe, petroleum cracking pipe, geological pipe and so on.
The outer diameter is usually larger than 38mm and the wall thickness ranges from 2.5-75mm.
They are usually used in construction, machinery manufacturing, fluid transportation and other scenarios.
The delivery state is usually hot rolled or heat treated.

Hot Rolled Seamless Steel Pipe Materials and Uses:

Ordinary seamless steel pipe is usually made of carbon structural steel such as 10, 20, 35, 45 or low alloy structural steel such as 16Mn.
Low carbon steel (such as 10, 20 steel) made of seamless pipe is mainly used for fluid transportation pipeline.
Seamless pipes made of medium carbon steel (e.g. No. 45 steel, 40Cr) are used to manufacture mechanical parts, such as the stressed parts of automobiles and tractors.
All ordinary seamless steel pipes need to ensure a certain degree of strength and flattening properties.

Hot rolled seamless steel pipe standard：

Steel Pipe Standards

Standard	Standard Name	Scope of Application	Main Use
US Standard	ASTM A106	Carbon steel seamless pipe	High-temperature and high-pressure fluid conveyance, such as oil, natural gas, and steam
US Standard	ASTM A53	Carbon steel seamless and welded pipes	Low-pressure applications in construction, machinery, and fluid conveyance
US Standard	ASTM A312	Stainless steel seamless and welded pipes	Chemical, pharmaceutical, and food processing industries
European Standard	EN 10216-2	Non-alloy and alloy steel seamless pipes	Petroleum, natural gas, and chemical industries
European Standard	EN 10216-5	Stainless steel seamless pipes	Chemical, pharmaceutical, and food processing
German Standard	DIN 17175	High-pressure boiler seamless steel pipes	Industrial boilers and heat exchangers
International Standard	ISO 11960	Petroleum casing	Petroleum extraction and conveyance
Japanese Standard	JIS G 3456	Carbon steel and alloy steel seamless pipes	Construction, machinery, and chemical industries
Chinese Standard	GB/T 8162-2018	Structural seamless steel pipes	Construction and mechanical manufacturing
Chinese Standard	GB/T 8163-2018	Seamless steel pipes for fluid conveyance	Petroleum, natural gas, and chemical industries

Name	Hot rolled seamless steel pipe
Alias	Thick-walled steel pipe
Materials	20#、45#、16mn
Outer diameter	38mm-630mm
Length	6m、9m、12m
Wall thickness	2.5mm-80mm

Process

Hot rolled seamless steel pipe: round billet→heating→piercing→three-roll slant rolling, continuous rolling or extrusion→detubing→dimensioning (or reduction)→cooling→billet→straightening→hydraulic test (or flaw detection)→marking→warehousing.

Theoretical Weight

Unit：Kg/m	/	/	/	/	/	/	/
WT / OD	3	3.5	4	4.5	5	5.5	6
32	2.146	2.460	2.762	3.052	3.329	3.594	3.847
38	2.589	2.978	3.354	3.718	4.069	4.408	4.735
42	2.885	3.323	3.749	4.162	4.562	4.951	5.327
45	3.107	3.582	4.044	4.495	4.932	5.358	5.771
50	3.477	4.014	4.538	5.049	5.549	6.036	6.511
54	3.773	4.359	4.932	5.493	6.042	6.578	7.103
57	3.995	4.618	5.228	5.826	6.412	6.985	7.546
60	4.217	4.877	5.524	6.159	6.782	7.392	7.990
63.5	4.476	5.179	5.869	6.548	7.214	7.867	8.508
68	4.809	5.567	6.313	7.047	7.768	8.477	9.174
70	4.957	5.740	6.511	7.269	8.015	8.749	9.470
73	5.179	5.999	6.807	7.602	8.385	9.156	9.914
76	5.401	6.258	7.103	7.935	8.755	9.563	10.358
89	6.363	7.380	8.385	9.378	10.358	11.326	12.281
108	7.768	9.020	10.259	11.486	12.701	13.903	15.093
133	11.178	12.725	14.261	15.783	17.294	18.792	/
159	13.422	15.290	17.146	18.989	20.821	22.639	/
219	18.601	21.209	23.805	26.388	28.959	31.517	/
273	23.262	26.536	29.797	33.046	36.283	39.508	/
325	27.750	31.665	35.568	39.458	43.337	47.202	/
355	38.897	43.158	47.406	51.641	/	/	/
377	41.339	45.871	50.390	54.897	/	/	/
426	46.777	51.913	57.036	62.147	/	/	/
450	/	/	/	/	/	/	/
480	/	/	/	/	/	/	/
530	/	/	/	/	/	/	/
630	/	/	/	/	/	/	/
Unit：Kg/m	/	/	/	/	/	/	/
WT/OD	6.5	7	8	8.5	9	10	12
32	4.088	/	/	/	/	/	/
38	5.049	/	/	/	/	/	/
42	5.691	/	/	/	/	/	/
45	6.172	/	/	/	/	/	/
50	6.973	7.423	8.286	8.699	/	/	/
54	7.614	8.114	9.075	9.538	/	/	/
57	8.095	8.632	9.667	10.167	/	/	/
60	8.576	9.149	10.259	10.796	/	/	/
63.5	9.137	9.754	10.950	11.529	/	/	/
68	9.858	10.530	11.838	12.473	/	/	/
70	10.179	10.876	12.232	12.892	13.539	14.797	17.164
73	10.660	11.394	12.824	13.521	14.205	15.537	18.052
76	11.141	11.912	13.416	14.150	14.871	16.277	18.940
89	13.225	14.156	15.981	16.875	17.756	19.483	22.787
108	16.270	17.436	19.729	20.858	21.973	24.168	28.410
133	20.278	21.751	24.662	26.098	27.522	30.334	35.809
159	24.446	26.240	29.791	31.548	33.293	36.746	43.503
219	34.064	36.598	41.629	44.126	46.610	51.543	61.259
273	42.720	45.920	52.283	55.445	58.596	64.860	77.240
325	51.056	54.897	62.542	66.346	70.137	77.684	92.629
355	55.865	60.076	68.460	72.634	76.796	85.082	101.507
377	59.391	63.873	72.801	77.246	81.679	90.508	108.018
426	67.246	72.332	82.468	87.518	92.555	102.592	122.519
450	71.093	76.475	87.203	92.549	97.882	108.511	129.621
480	75.902	81.654	93.122	98.837	104.540	115.909	138.499
530	83.917	90.286	102.987	109.319	115.638	128.240	153.296
630	99.947	107.549	122.716	130.281	137.833	152.902	182.89

Specifications

Specifications	Specifications	Specifications
12×1.5	73×4-4.5-5-6-7-8-9-10-12-15	219×30-40
14×1.5-2.5-3	76×4-4.5-5-6-7-8-9-10-12-14	245×8-10-14-17-20-22
16×1.5-2.5-4	83×4.5-5-10/ 12 14 16 18 20	245×25-28-30-34-40
18×2.3-4-5	89×4.5-8-10/12-14 16 -18 20	273×7-9-12-15-18-20-25
20×2.5-3-5	95×4.5-6-8/10-12-14-16-20	273×30-35-38-40
24×2.5-3-4-5-6	102×4.5-5-6-7-8-10-12-14-16-20	299×8-12-16-20-24-28
25×2.5-3-4-5-6	108×4.5-5-6-7-8-10/12-14-18-20-22	299×30-32-36-38-40
28×3-3.5-4-5-6	114×4.5-5-6-7-8-10-12-14-18-20	325×8-12-14-18-38
32×3.5-4-5-6-8	121×4.5-5-6-7-8-10-12-14-16-20	325×28-32-34-38
34×4-5-6-8	127×4.5-5-6-7-8-10-12-14-16-20	351×10-16-20-25-40
36×3.5-5-6-8	133×4.5-6-8-12-14-16-18-20-25-30	355×6-18-20-25-30-40
38×4-5-6-7-8-9-10	140×5-6-7-8-9-10/12-14-16-20-22	377×8-12-15-20-24-28
39×3.5-5-8-10	146×4.5-6-8-12-14-16-18-20-25-30	377×30/37/40
42×3.5-4-5-6-7-8-9-10	152×4.5-6-8-12-14-16-18-20-25-30	402×10/15-20-25-30-35
45×3.5-4-5-6-7-8-9	159×4.5-6-10-12-14	406×10/20-25-28-35-40
48×3.5-4-5-6-7-8-9-10	159×16-18-20-22-25-30	426×10/12-14-16-20-25-30-35-40
51×3.5-4-5-6-7-8-9-10	168×8-10/12/14/20/25/30/35	450×10/12-14-16-20-25-34-40
56×3.5-4-5-6-7-8-9-10	180×8-12-16-25-30	480×10/ 12 14 16 18 20 25 30 40
57×3.5-5-6-7-8-9-10-12	180×32-34-38-40	500×10/12-14-16-20-25-34-40
60×3.5-4.5-5-6-7-8-9-12-14	194×6-8-12-16-20-25-30-40	510×10/12-14-16-20-25-34-40
63×3.5-4.5-5-6-7-8-9-10-12-14	203×6-7-10-15-20-25-30	530×10/ 12 14 16 18 20 30-40
68×4-4.5-5-6-7-8-9-10-12-14-16	203×32-36-40	-
70×4-4.5-5-6-7-8-9-10-12-15-16	219×6-8-12-16-18-20-25	-

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