GB18248 High Pressure Gas Cylinder Tube 37mn 34CrMo4 30cr Alloy Seamless Steel Pipe for LNG CNG Cylinder

• Customization: Available
• After-sales Service: 12 Years
• Warranty: 12 Years
• Model NO.: bks-cng
• Technique: Cold Drawn
• Material: Carbon Steel
• Surface Treatment: Varnishing
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Construction & Decoration, Special Purpose
• Section Shape: Round
• Trade Term: Fob EXW CFR CIF Fca
• Material Grade: 34CrMo4
• Shape: Round
• Delivery Time: 7-10 Days
• Transport Package: Normal Sea Worthy Package
• Specification: OD8MM~1219MM, WT.: 1MM~100MM
• Trademark: BKS
• Origin: China
• HS Code: 73041930
• Production Capacity: 5000ton/Month

Product Description

Product Description

JIS G3441 Alloy Steel Tube for Machine Purposes

alloy steel tubes used for machinery, automobiles and other machine parts
 

JIS G3441 Alloy Steel Tubes Dimensions and dimensional tolerances

Outside diameter: 20-800mm
Wall Thickness: 1-150mm
tolerance: +/-1% OD ; +/- 12.5% WT
 

JIS G3441 Alloy Steel Tubes Chemical Component

Designation of grade	C	Si	Mn	P	s	Ni	Cr	Mo	Cu
SMn420TK	0.17 to 0.23	0.15 to 0.35	1.20 to 1.50	0.030 max.	0.030 max.	0.25 max.	0.35 max.	/	0.30 max.
SMn433TK	0.30 to 0.36	0.15 to 0.35	1.20 to 1.50	0.030 max.	0.030 max.	0.25 max.	0.35 max.	/	0.30 max.
SMn438TK	0.35 to 0.41	0.15 to 0.35	1.35 to 1.65	0.030 max.	0.030 max.	0.25 max.	0.35 max.	/	0.30 max.
SMn443TK	0.40 to 0.46	0.15 to 0.35	1.35 to 1.65	0.030 max.	0.030 max.	0.25 max.	0.35 max.	/	0.30 max.
SMnC420TK	0.17 to 0.23	0.15 to 0.35	1.20 to 1.50	0.030 max.	0.030 max.	0.25 max.	0.35 to 0.70	/	0.30 max.
SMnC443TK	0.40 to 0.46	0.15 to 0.35	1.35 to 1.65	0.030 max.	0.030 max.	0.25 max.	0.35 to 0.70	/	0.30 max.
SCM15TK	0.13 to 0.18	0.15 to 0.35	0.60 to 0.90	0.030 max.	0.030 max.	0.25 max.	0.90 to 1.20	/	0.30 max.
SCM20TK	0.18 to 0.23	0.15 to 0.35	0.60 to 0.90	0.030 max.	0.030 max.	0.25 max.	0.90 to 1.20	/	0.30 max.
SCr430TK	0.28 to 0.33	0.15 to 0.35	0.60 to 0.90	0.030 max.	0.030 max.	0.25 max.	0.90 to 1.20	/	0.30 max.
SCr435TK	0.33 to 0.38	0.15 to 0.35	0.60 to 0.90	0.030 max.	0.030 max.	0.25 max.	0.90 to 1.20	/	0.30 max.
SCM40TK	0.38 to 0.43	0.15 to 0.35	0.60 to 0.90	0.030 max.	0.030 max.	0.25 max.	0.90 to 1.20	/	0.30 max.
SCM45TK	0.43 to 0.48	0.15 to 0.35	0.60 to 0.90	0.030 max.	0.030 max.	0.25 max.	0.90 to 1.20	/	0.30 max.
SCM415TK	0.13 to	0.15 to	0.60 to	0.030	0.030	0.25	0.90 to	0.15 to	0.30
	0.18	0.35	0.90	max.	max.	max.	1.20	0.25	max.
SCM418TK	0.16 to	0.15 to	0.60 to	0.030	0.030	0.25	0.90 to	0.15 to	0.30
	0.21	0.35	0.90	max.	max.	max.	1.20	0.25	max.
SCM420TK	0.18 to	0.15 to	0.60 to	0.030	0.030	0.25	0.90 to	0.15 to	0.30
	0.23	0.35	0.90	max.	max.	max.	1.20	0.25	max.
SCM421TK	0.17 to	0.15 to	0.70 to	0.030	0.030	0.25	0.90 to	0.15 to	0.30
	0.23	0.35	1.00	max.	max.	max.	1.20	0.25	max.
SCM425TK	0.23 to	0.15 to	0.60 to	0.030	0.030	0.25	0.90 to	0.15 to	0.30
	0.28	0.35	0.90	max.	max.	max.	1.20	0.30	max.
SCM430TK	0.28 to	0.15 to	0.60 to	0.030	0.030	0.25	0.90 to	0.15 to	0.30
	0.33	0.35	0.90	max.	max.	max.	1.20	0.30	max.
SCM432TK	0.27 to	0.15 to	0.30 to	0.030	0.030	0.25	1.00 to	0.15 to	0.30
	0.37	0.35	0.60	max.	max.	max.	1.50	0.30	max.
SCM435TK	0.33 to	0.15 to	0.60 to	0.030	0.030	0.25	0.90 to	0.15 to	0.30
	0.38	0.35	0.90	max.	max.	max.	1.20	0.30	max.
SCM440TK	0.38 to	0.15 to	0.60 to	0.030	0.030	0.25	0.90 to	0.15 to	0.30
	0.43	0.35	0.90	max.	max.	max.	1.20	0.30	max.
SCM445TK	0.43 to	0.15 to	0.60 to	0.030	0.030	0.25	0.90 to	0.15 to	0.30
	0.48	0.35	0.90	max.	max.	max.	1.20	0.35	max.
SCM822TK	0.20 to	0.15 to	0.60 to	0.030	0.030	0.25	0.90 to	0.35 to	0.30
	0.25	0.35	0.90	max.	max.	max.	1.20	0.45	max.
SNC236TK	0.32 to 0.40	0.15 to 0.35	0.50 to 0.80	0.030 max.	0.030 max.	1.00 to 1.50	0.50 to 0.90	/	0.30 max.
SNC415TK	0.12 to 0.18	0.15 to 0.35	0.35 to 0.65	0.030 max.	0.030 max.	2.00 to 2.50	0.20 to 0.50	/	0.30 max.
SNC631TK	0.27 to	0.15 to	0.35 to	0.030 max.	0.030 max.	2.50 to	0.60 to	/	0.30 max.
	0.35	0.35	0.65			3	1
SNC815TK	0.12 to	0.15 to	0.35 to	0.030 max.	0.030 max.	3.00 to	0.60 to	/	0.30 max.
	0.18	0.35	0.65			3.5	1
SNC836TK	0.32 to	0.15 to	0.35 to	0.030 max.	0.030 max.	3.00 to	0.60 to	/	0.30 max.
	0.4	0.35	0.65			3.5	1
SNCM220TK	0.17 to	0.15 to	0.60 to	0.030 max.	0.030 max.	0.40 to	0.40 to	0.15 to	0.30 max.
	0.23	0.35	0.9			0.7	0.6	0.25
SNCM240TK	0.38 to	0.15 to	0.70 to	0.030 max.	0.030 max.	0.40 to	0.40 to	0.15 to	0.30 max.
	0.43	0.35	1			0.7	0.6	0.3
SNCM415TK	0.12 to	0.15 to	0.40 to	0.030 max.	0.030 max.	1.60 to	0.40 to	0.15 to	0.30 max.
	0.18	0.35	0.7			2	0.6	0.3
SNCM420TK	0.17 to	0.15 to	0.40 to	0.030 max.	0.030 max.	1.60 to	0.40 to	0.15 to	0.30 max.
	0.23	0.35	0.7			2	0.6	0.3
SNCM431TK	0.27 to	0.15 to	0.60 to	0.030 max.	0.030 max.	1.60 to	0.60 to	0.15 to	0.30 max.
	0.35	0.35	0.9			2	1	0.3
SNCM439TK	0.36 to	0.15 to	0.60 to	0.030 max.	0.030 max.	1.60 to	0.60 to	0.15 to	0.30 max.
	0.43	0.35	0.9			2	1	0.3
SNCM447TK	0.44 to	0.15 to	0.60 to	0.030 max.	0.030 max.	1.60 to	0.60 to	0.15 to	0.30 max.
	0.5	0.35	0.9			2	1	0.3
SNCM616TK	0.13 to	0.15 to	0.80 to	0.030 max.	0.030 max.	2.80 to	1.40 to	0.40 to	0.30 max.
	0.2	0.35	1.2			3.2	1.8	0.6
SNCM625TK	0.20 to	0.15 to	0.35 to	0.030 max.	0.030 max.	3.00 to	1.00 to	0.15 to	0.30 max.
	0.3	0.35	0.6			3.5	1.5	0.3
SNCM630TK	0.25 to	0.15 to	0.35 to	0.030 max.	0.030 max.	2.50 to	2.50 to	0.50 to	0.30 max.
	0.35	0.35	0.6			3.5	3.5	0.70 b)
SNCM815TK	0.12 to	0.15 to	0.30 to	0.030 max.	0.030 max.	4.00 to	0.70 to	0.15 to	0.30 max.
	0.18	0.35	0.6			4.5	1	0.3
SACM645TK	0.40 to	0.15 to	0.60 max.	0.030 inax.	0.030 max.	0.25 max.	1.30 to	0.15 to	0.30 max.
	0.5	0.5					1.7	0.3

 

JIS G3441 Alloy Steel Tubes Manufacturing method

The manufacturing method shall be as follows.
a) The tubes shall be manufactured by combination of the tube manufacturing method and the finishing method indicated in Table 1. If required, the appropriate heat treatment may be designated on tubes.
b) If required, the purchaser may designate the heat treatment.
c) The shape of end of tube shall be plain-ended, unless otherwise specified.
 

JIS G3441 Alloy Steel Tubes Flattening resistance

Alloy steel tubes shall be tested in accordance with 9.2, without cracks on the weld of test pieces when the distance between the plates is seven eighth of outside diameter. When agreed between the purchaser and the manufacturer, the
specifications for flattening resistance may not be applied.
 

JIS G3441 Alloy Steel Tubes Appearance

The appearance shall be as follows.
a) The tubes shall be straight for practical purposes and the both ends thereof shall be at right angles to the tube axis.
b) The tubes shall be smoothly finished and free from defects detrimental to use.
c) The tubes may be repaired by grinding, machining or other methods, provided that the wall thickness after repair still satisfies the specified tolerances on the wall thickness.
d) The surface of repaired part shall be smooth along the contour of the tube.
e) When there is a special request concerning the surface finishing of tubes, it shall be upon the agreement between the purchaser and the manufacturer.
 

JIS G3441 Alloy Steel Tubes Marking

Each tube which passed the inspection shall be marked with the following items. The arrangement of marking is not specified. Addition of boron, when designated, shall be suffixed to the designation of grade. When tubes of smaller outside diameter are used or when there is a special request by the purchaser, marking may be applied on a bundle by an appropriate method. When approved by the purchaser, part of the items may be omitted to such extent that the product can be identified
 

JIS G3441 Alloy Steel Tubes Test

Tensile test
Charpy pendulum impact test
Brinell hardness test
Vickers hardness test
Rockwell hardness test
Grain size test
Non-metalic inclusion test
Determination test of depth of decarburization
Hardenability test
Ultrasonic examination
Eddy current examination

 

 

 

 

 

 

 

 

 

 

 

JIS G3441 Alloy Steel Tubes Manufacturing method

Chemical composition(%) of precision pipe's commin grade

Standard	Grade	C	Si	Mn	s	p	Cr
GB/T 699 GB/T 3639 GB3077 GB/T1591 GB/T 8163-2018	10#	0.07~0.13	0.17~0.37	0.35~0.65	≤0.035	≤0.035	\
	20#	0.17~0.23	0.17~0.37	0.35~0.65	≤0.035	≤0.035	\
	35#	0.32~0.39	0.17~0.37	0.35~0.65	≤0.035	≤0.035	\
	45#	0.42~0.50	0.17~0.37	0.50~0.80	≤0.035	≤0.035	\
	40Cr	0.37~0.44	0.17~0.37	0.50~0.80	≤0.035	≤0.035	0.08~1.10
	25Mn	0.22~0.29	0.17~0.37	0.70~1.00	≤0.035	≤0.035	≤0.25
	Q345B	≤0.20	≤o.50	≤1.7	≤0.035	≤0.035	≤0.3
	37Mn5	0.30~0.39	0.15~0.30	1.20~1.50	≤0.015	≤0.020	\

Conventional mechanical properties of precision pipe

Standard	Grade	Delivery Conditions
		BK(hard)		BKW(soft)
		Tensil Stength(Mpa)	Make percentage elongation(%)	Tensile stength(Mpa)	Make percentage elongation(%)
GB/T 3639 GB 3077	20#	≥550	≥10	≥490	≥15
	25Mn	≥600	≥12	≥540	≥15
	Q345B	≥620	≥12	≥550	≥15
	45#	≥645	≥8	≥625	≥15
	40Cr	≥784	≥14	\	\
	37Mn5	≥784	≥14	\	\

Dimensional tolerances of inner diameter
 

Standard	Inner Diameter(mm)	Inner Diameter Deviation(mm)
GB1801-79		H7	H8	H9	H10
	30	0~+21	0~+33	0~+52	0~+84
	30-50	0~+25	0~+39	0~+62	0~+100
	50-80	0~+30	0~+46	0~+74	0~+120
	80-120	0~+35	0~+54	0~+87	0~+140
	120-180	0~+40	0~+63	0~+100	0~+160
	180-250	0~+46	0~+72	0~+115	0~+185
	250-315	0~+52	0~+81	0~+170	0~+210
	315-400	0~+57	0~+89	0~+140	0~+230

Products display

Packing and shipping
 


Company information 

     Tianjin Boer King Steel is a  professional  trading company and has been in steel industry for more than 15years, specializing in seamless steel pipe,oil casing/drill pipe, galvanized steel pipe, stainless steel pipe,ERW/SSAW/LSAW/ welded pipe.

      Also we sale hot and cold rolled steel coils,steel plates,galvanized steel coils, all kinds of profiles like H-beam, Angel bar,C profile etc.

      We have established long term cooperations with several famous steel manufactures all over the world, and we can offer you best quality products with competitive price which will give you an edge over your competitors.

      Besides, we offer best service all the time.We will do our best to satisfy you needs for the products. Our products have been sold in many countries and areas of the world including South America, Iran, Kenya, Israel etc, and our export volume reaches 160,000tons per year.
 
      We execute quality gurantee system ISO 9001,2008 strictly and all certicates and the third party inspection like MTC,API,ABS,ISO9001,SGS BV etc. will be provided as client's requirements.



FAQ

Q1:How about the quality?
A:Third party inspections are always welcomed, like TUV, BV, SGS.   All of the goods will be released together with MTC and stamped by TPI. 

Q2: Can you accept customization?
A: Yes.we can do customization for you.

Q3: Do you provide samples? Free or not?
A: Yes, we could offer the sample for free but do not pay the cost of freight.

Q4: How long is the delivery time?
A: Generally about 5-10 days if the goods in stock. Or will be 15-30 days if not in stock.

Q5: How about the trade terms?
A: EXW, FOB, CFR, CIF, LC will be accepted.


Contact: Cindy yang(86-136-220-11-358)
Boer King Steel Group
Tianjin Boer King Steel Pipe Co.,Ltd
Tianjin Boer King Steel Co.,Ltd
Add: No.602,Shuanggang Development Zone,Tianjin,300350 China.