Structural seamless pipes

 

With its enhanced cross-sectional efficiency, it makes a major contribution to lightweight, economic structural design. In addition, its attractive round appearance facilitates elegant and beautiful structures.

ASTM A53 standard specifications

ASTM A53 Standard Spec. for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A53 / A53M Standard covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS 26.

Steel grade:

• 10, 20, 35, 45, Q345, 15CrMo, 12Cr1MoV, A53A, A53B, SA53A, SA53B

Application： for the manufacture of pipelines, containers, equipment, fittings and mechanical structures .

Types of steel pipe for machine structures

Steel pipe application in structure engineering is generated in the carbon steel smelting defect smelting and casting process, such as segregation, non-metallic inclusions, porosity, shrinkage and cracks.

Steel pipe application in structure engineering

Product name	Manufacturing method	Main features and applications
Carbon Steel Pipe for Machine Structures	These products normally conform to JIS G 3445 Carbon Steel Tubes for Machine Structural Purposes.  We also manufacture such carbon steel pipe products using materials that conform to JIS G 4051 Steel for Machine Structural Purposes, as well as to other standards and specifications.	These steel pipe products are used in machines, automobiles, bicycles, furniture, tools and utensils, and other machine parts.
Alloy Steel Pipe for Machine Structures	These products normally conform to JIS G 3441 Alloy Steel Tubes for Machine Structure Purposes, but we also manufacture such alloy steel pipe products using materials that conform to JIS G 4053 Low-Alloyed Steels for Machine Structural Use, as well as to other standards and specifications.	These steel pipe products are used in machines, automobiles, and other machine parts.
ERW Carbon Steel Pipe for Machine Structures	These products are manufactured based on JIS G 3472 Electric Resistance Welded Carbon Steel Tubes for Automobile Structural Purposes.	They are used mainly in automotive machine parts.
High-Strength Steel Pipe for Machine Structures	These steel pipe products, include seamless steel pipe, ERW steel pipe, and hot finished ERW steel pipe.	They are used in marine structures and cylinders for their excellent weldability and low-temperature properties, and in machine parts for reduced weight and increased strength.

Type		Signal	Tensile testing
			Tensile strength kg/㎟ (MIN)	Yield point kg/㎟ (MIN)	Elongation(%) (MIN)
					Grade 11 Test piece Grade 12 Test piece Longitudinal	Grade 5 Test piece transverse
11 Type	A	STKM11A	30 or more	-	35 or more	30 or more
12 Type	A	STKM12A	35 or more	18 or more	35 or more	30 or more
	B	STKM12B	40 or more	28 or more	25 or more	20 or more
	C	STKM12C	48 or more	36 or more	20 or more	15 or more
13 Type	A	STKM13A	38 or more	22 or more	30 or more	25 or more
	B	STKM13B	45 or more	31 or more	20 or more	15 or more
	C	STKM13C	52 or more	39 or more	15 or more	10 or more
14 Type	A	STKM14A	42 or more	25 or more	25 or more	20 or more
	B	STKM14B	51 or more	36 or more	15 or more	10 or more
	C	STKM14C	56 or more	42 or more	15 or more	10 or more
15 Type	A	STKM15A	48 or more	28 or more	22 or more	17 or more
	C	STKM15C	59 or more	44 or more	12 or more	7 or more
16 Type	A	STKM16A	52 or more	33 or more	20 or more	15 or more
	C	STKM16C	63 or more	47 or more	12 or more	7 or more
17 Type	A	STKM17A	56 or more	35 or more	20 or more	15 or more
	C	STKM17C	66 or more	49 or more	10 or more	5 or more
18 Type	A	STKM18A	45 or more	28 or more	25 or more	20 or more
	B	STKM18B	50 or more	32 or more	23or more	18or more
	C	STKM18C	52 or more	39 or more	15 or more	10 or more
19 Type	A	STKM19A	50 or more	32 or more	23 or more	18 or more
	C	STKM19C	56 or more	42 or more	15 or more	10 or more
20 Type	A	STKM20A	55 or more	40 or more	23 or more	18 or more

Type		Signal	Tensile testing					Intended use
			C	Si	Mn	P	S
11 Type	A	STKM11A	0.12 Less than	0.35 Less than	0.60 Less than	0.040 Less than	0.040 Less than	Starter Motor Yoke General use
12 Type	A	STKM12A	0.20	0.35	0.60	0.040	0.040	Cross Member Jack Propeller Shaft The Rod
	B	STKM12B
	C	STKM12C
13 Type	A	STKM13A	0.25	0.35	0.30~0.90	0.040	0.040	Propeller Shaft Steering Shaft Oil pressure Cylinder, Axle Tube
	B	STKM13B
	C	STKM13C
14 Type	A	STKM14A	0.30	0.35	0.30~1.00	0.040	0.040	Oil pressure Cylinder Axle Tube
	B	STKM14B
	C	STKM14C
15 Type	A	STKM15A	0.25~0.35	0.35	0.35~1.00	0.040	0.040	Extensing Tube Cross Member
	C	STKM15C
16 Type	A	STKM16A	0.35~0.45	0.40	0.40~1.00	0.040	0.040	Rocker Arm Tube Axle Tube Steering System
	C	STKM16C
17 Type	A	STKM17A	0.45~0.55	0.40	0.40~1.00	0.040	0.040	Boring Rod Axle Tube
	C	STKM17C
18 Type	A	STKM18A	0.18	0.55	1.50	0.040	0.040	Hydraulic prop Fork Tube Boom Repeated oil pressure Cylinder
	B	STKM18B
	C	STKM18C
19 Type	A	STKM19A	0.25	0.55	1.50	0.040	0.040
	C	STKM19C
20 Type	A	STKM20A	0.25	0.55	1.60	0.040	0.040

Division	Tolerance for outer diameter
No. 1	50mm Less than 50mm or more		±0.5mm ±1%
No. 2	50mm Less than 50mm or more		±0.25mm ±0.5%
No. 3	25mm Less than 25mm or more 40mm or more 50mm or more 60mm or more 70mm or more 80mm or more 90mm or more 100mm or more	40mm Less than 50mm Less than 60mm Less than 70mm Less than 80mm Less than 90mm Less than 100mm Less than	±0.12mm ±0.15mm ±0.18mm ±0.20mm ±0.23mm ±0.25mm ±0.30mm ±0.40mm ±0.50%

Steel Pipe for Building Structures

Advanced, high-performance steel pipe that can be found on almost any construction site.

In addition to delivering its highly trusted JIS-compliant steel pipe for building structures (e.g., STK and STKR) for a long time. In addition, we engage constantly and actively in R&D, so that we can deliver even more advanced and capable materials.

Tolerance:

Steel type	Pipe Out diameter （D）		Pipe wall thickness （S）
Cold Drawing Pipe	O.D. (mm)	Tolerance (mm)	W.T. (mm)	Tolerance (mm)
	＞30-50	±0.3	≤30	±10％
	＞50-219	±0.8％
Hot Rolled Pipe	＞219	±1.0％	＞20	±10％

Mechanical properties:

Standard	Grade	Tensile Strength （MPa）	Yield strength （MPa）	elongation （％）
GB/T8162	10	≥335	≥205	≥24
	20	≥390	≥245	≥20
	35	≥510	≥305	≥17
	45	≥590	≥335	≥14
	Q345	≥490	≥325	≥21
	15CrMo	≥440	≥295	≥22
	12Cr1MoV	≥490	≥245	≥22
ASTM A53 ASME SA53	A	≥330	≥205	查看ASTM A53的表 查看ASME SA53的表
	B	≥415	≥240

Chemical composition:

Standard	Grade	Composition（％）
		C	Si	Mn	P	S	Cu	Ni	Mo	Cr	V
GB/T8162	10	0.07-0.14	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.25	≤0.25	/	≤0.15	/
	20	0.17-0.24	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.25	≤0.25	/	≤0.25	/
	35	0.32-0.40	0.17-0.37	0.50-0.80	≤0.035	≤0.035	≤0.25	≤0.25	/	≤0.25	/
	45	0.42-0.50	0.17-0.37	0.50-0.80	≤0.035	≤0.035	≤0.25	≤0.25	/	≤0.25	/
	Q345	0.12-0.20	0.20-0.55	1.20-1.60	≤0.035	≤0.035	≤0.25	≤0.25	/	≤0.25	/
	15CrMo	0.12-0.18	0.17-0.37	0.40-0.70	≤0.035	≤0.035	≤0.25	≤0.30	0.40-0.55	0.80-1.10	/
	12Cr1MoV	0.08-0.15	0.17-0.37	0.40-0.70	≤0.035	≤0.035	≤0.25	≤0.30	0.25-0.35	0.90-1.20	0.15-0.30
ASTMA53 ASMESA53	A	≤0.25	/	≤0.95	≤0.05	≤0.06	≤0.40	≤0.40	≤0.15	≤0.40	≤0.08
	B	≤0.30	/	≤1.20	≤0.05	≤0.06	≤0.40	≤0.40	≤0.15	≤0.40	≤0.08

Tubes for Tubes for structure

Tubes for structure are used for the manufacture of pipelines, vessels, equipment, pipe fittings, and steel structures.

Standard

• GB/T 8162 China National standard : Seamless steel tubes for structure
• DIN 1629 Deutsche Industrie Normen : Seamless Circular Tubes of Non-Alloys Steels with Special Quality Requirements.

Chemical compisition:

Standard	Grade	C	Si	Mn	S	Cr	Ni	Cu	V
GB/T 8162	10	0.07-0.13	0.17-0.37	0.35-0.65	≤0.025	≤0.15	≤0.30	≤0.25	""
	20	0.17-0.23	0.17-0.37	0.35-0.65	≤0.025	≤0.25	≤0.30	≤0.25	""
	35	0.32-0.39	0.17-0.37	0.50-0.80	≤0.025	≤0.25	≤0.30	≤0.25	""
	45	0.42-0.50	0.17-0.37	0.50-0.80	≤0.025	≤0.25	≤0.30	≤0.25	""
	Q345A	≤0.20	≤0.55	1.00-1.60	≤0.025	≤0.30	≤0.30	≤0.30	""
	Q345B	≤0.20	≤0.55	1.00-1.60	≤0.025	≤0.30	≤0.30	≤0.30	""
	Q345C	≤0.20	≤0.55	1.00-1.60	≤0.025	≤0.30	≤0.30	≤0.30	0.02-0.15
	Q345D	≤0.18	≤0.55	1.00-1.60	≤0.025	≤0.30	≤0.30	≤0.30	0.02-0.15
	Q345E	≤0.18	≤0.55	1.00-1.60	≤0.025	≤0.30	≤0.30	≤0.30	0.02-0.15
Q/BQB 203 DIN 1629	St37.0	≤0.17	0.17-0.37	0.35-0.65	≤0.025	≤0.020	≤0.25	≤0.25	""
	St44.0	≤0.21	0.17-0.37	0.50-0.80	≤0.025	≤0.020	≤0.25	≤0.25	""
	St55	0.33-0.41	0.17-0.37	0.50-0.80	≤0.025	≤0.020	≤0.25	≤0.25	""
	St52.0	≤0.22	≤0.55	≤1.60	≤0.025	≤0.020	≤0.25	≤0.25	""
	CK45	0.42-0.50	0.17-0.37	0.50-0.80	≤0.025	≤0.020	≤0.25	≤0.25	""

Note: Grades other than the a.m. chart can be made available through consultations.

Mechanical properties:

Standard	Grade	Tensile strength (Mpa)	Yield point(Mpa) not less than		Elongation(%) not less than	Impact test
			≤16mm	>16-30mm		Temperature (°C)	Absorbed energy (KV/J)
GB/T 8162	10	≥335	205	195	24	--	--
	20	≥410	245	235	20	--	--
	35	≥510	305	295	17	--	--
	45	≥590	335	325	14	--	--
	Q345A	470-630	345	325	20	--	--
	Q345B	470-630	345	325	20	20	34
	Q345C	470-630	345	325	21	0	34
	Q345D	470-630	345	325	21	-20	34
	Q345E	470-630	345	325	21	-40	27
Q/BQB 203 DIN 1629	--	--	≤16mm	>16mm	--	--	--
	St37.0	350-480	235	225	25	--	--
	St44.0	420-550	275	265	21	--	--
	St55	540-645	295	285	17	--	--
	St52.0	500-650	355	345	21	--	--
	CK45	590-730	335	325	14	--	--