Stkm11A Stkm12A Stkm12b Stkm12c Stkm13A Stkm13b Stkm13c S45c Steel Tube

• Customization: Available
• Type: Seamless
• Technique: Cold Drawn
• Usage: Hydraulic/Automobile Pipe
• Section Shape: Round
• Standard: DIN 2391, En10305-1, En10305-4, SAE J524
• Delivery Condition: Bk, Gbk, Bkw, Bks or Nbk
• Steel Grade: St35, St37, St37.4, E235, E355, St45, St52.4, 1010
• Certificate: ISO 9001 Ts16949
• Secondary or Not: Non-Secondary
• Application: Automotive Industry, Hydraulic System, Other Indus
• Transport Package: Plywood Box or Budles
• Specification: OD2mm -60mm/ 0.125-1.5inch
• Trademark: CW
• Origin: China
• HS Code: 7304319000

Product Description

JIS G3445 STKM11 STKM12 STKM13 cold drawn seamless steel tube 

High Precision Seamless Steel Tube for Automotive Industry, Hydraulic Application and Mechanical Application

 

APPLICATIONS

1. Automotive fields

 A. Fuel injection lines/nozzles

 B. CNG (Compressed Nature Gas) tube-- Burst pressure: 1307Bar, Working Pressure: around 350bar

C. Drive transmission: Steering column elements

 D. Gear shafts, hand brake, front axles, airbag inflators, stabilizers, seat fasteners, front-wheel drive shafts
 
E.  Shock absorber and others 

2. Hydraulic Fields

A. Hydraulic circuits (HPL), pneumatic lines, and hydraulic suspension system

B. Hydraulic cylinders (HPZ)

3. Other Fields

Hydraulic machines, Hydraulic cylinder, heat exchanger, high precision machines, oil lines, and others mechanical application 


ADDITIONAL SURFACE TREATMENT AFTER TUBE MAKING
 

1. Galvanizing 

 A. Silver galvanized

 B. Yellow galvanized

 C. Olive green coated

 Layer thickness: 8-20um, Salty Spray Test: 48-150 hours

 2.Black phosphate

 

 

	Material Chemical Composition (%)
	Steel Grade	Material Number	C   Max	Si     Max	Mn	P    Max	S   Max	Cr	Mo	Tensile strength Rm    (Mpa) Min	Yield Strength Reh   (Mpa) Min	A Elongation(%) Min
JIS G3445	STKM 11A	-	0.12	0.35	Max 0.60	0.04	0.04	-	-	290	-	35
	STKM 12A	-	0.12	0.35	Max 0.60	0.04	0.04	-	-	340	175	30
	SKTM 12B	-	0.12	0.35	Max 0.60	0.04	0.04	-	-	390	275	25
	SKTM 12C	-	0.12	0.35	Max 0.60	0.04	0.04	-	-	470	355	20
	STKM 13A	-	0.25	0.35	0.3-0.9	0.04	0.04	-	-	370	215	30
	STKM 13B	-	0.25	0.35	0.3-0.9	0.04	0.04	-	-	440	305	20
	STKM 13C	-	0.25	0.35	0.3-0.9	0.04	0.04	-	-	510	380	15

 

	Material Chemical Composition (%)
Standard	Steel Grade	Material Number	C	Si	Mn	P	S	Cr	Mo
DIN 2391	ST35	1.0308	<= 0.17	<= 0.35	>=0.04	<=0.025	<=0.025	-	-
	ST45	1.0408	<= 0.21	<= 0.35	>=0.04	<=0.025	<=0.025	-	-
	ST52	1.058	<= 0.22	<= 0.55	<=1.60	<=0.025	<=0.025	-	-
	BK		BKW		BKS			GBK
Steel Grade	Rm Tensile Strength  (Mpa) Min	A Elongation(%) Min	Rm Tensile Strength (Mpa) Min	A Elongation(%) Min	Rm Tensile Strength (Mpa) Min	Rel Yield Strength(Mpa) Min	A             Elongation  (%) Min	Rm Tensile Strength (Mpa)Min	A Elongation (%)Min
ST35	480	6	420	10	420	315	14	315	25
ST45	580	5	520	8	520	375	12	390	21
ST52	640	4	580	7	580	420	10	490	22

Standard	Steel Grade	Material Number	C	Si	Mn	P	S	Cr	Mo
EN10305-1 EN10305-4	E235	1.0308	<= 0.17	<= 0.35	>=0.04	<=0.025	<=0.025	-	-
	E255	1.0408	<= 0.21	<= 0.35	>=0.04	<=0.025	<=0.025	-	-
	E355	1.058	<= 0.22	<= 0.55	<=1.60	<=0.025	<=0.025	-	-

Steel Grade	(+C)		(+LC)		(+SR)			(+A)		(+N)
	Rm Tensile Strength  (Mpa) Min	A Elongation(%) Min	Rm Tensile Strength (Mpa) Min	A Elongation(%) Min	Rm Tensile Strength (Mpa) Min	Rel Yield Strength(Mpa) Min	A             Elongation  (%) Min	Rm Tensile Strength (Mpa)Min	A Elongation (%)Min	Rm Tensile Strength (Mpa)	Rel Yield Strength  (Mpa) Min	A Elongation (%) Min
E235	480	6	420	10	420	350	16	315	25	340-480	235	25
E255	580	5	520	8	520	375	12	390	21	440-570	255	21
E355	640	4	580	7	580	450	10	450	22	490-630	355	22

	Material Chemical Composition (%)
	Steel Grade	Material Number	C	Si	Mn	P	S	Cr	Mo
GB/T 8162   GB/T 8163   GB/T 3639	10	-	0.07-0.14	0.17-0.35	0.35-0.65	<=0.035	<=0.04	-	-
	20	-	0.17-0.23	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	-	-
	Q345B/16Mn	-	≤0.20	≤0.50	<=1.70	≤0.035	≤0.035	-	-

Many other steel grades and customized - modified steel grades are available on request

Some samples of related steel grade
GB	TOCT	ASTM	BS	JIS	NF	DIN
10F		1010	040A10		XC10
10	10	10,101,012	045M10	S10C	XC10	C10,CK10
20	20	1020	050A20	S20C	XC18	C22,CK22
45	45	1045	080M46	S45C	XC45	C45,CK45
30CrMo	30XM	4130	1717COS110	SCM420	30CD4
42CrMo		4140	708A42		42CD4	42CrMo4
			708M40
35CrMo	35XM	4135	708A37	SCM3	35CD4	34CrMo4

 

Delivery conditions:  Precision tubes are delivered in following conditions (first symbol lists previous designation, the new one according to EN is in brackets):
BK (+C) Cold finished/hard (cold finished as drawn).
No heat treatment after last cold forming process.
BKW (+LC) Cold finished/soft (lightly cold worked).
After last heat treatment there is a light finishing pass (cold drawing).
BKS (+SR) Cold finished/stress relieve annealed.
After the final cold forming process the tubes are stress relieve annealed.
GBK (+A) Annealed.
After the final cold forming process the tubes are annealed in a controlled atmosphere.
NBK (+N) Normalized.
After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere.

 

Tests: all tubes are checked according to the relevant production standard;supplementary/optional tests are available on request; chemical mechanical and   technological tests are made according to relevant standard

 

Certificates: according to EN 10204 3.1 

 

Packed in bundles or boxes