DIN1630 St37.4 St44.4 St52.4 Cold Drawn Precision Seamless Steel Tube

• Type: Seamless
• Technique: Cold Drawn
• Material: Carbon Steel
• Surface Treatment: Bright, Black Phosphated, Galvanizing
• Usage: Hydraulic/Automobile Pipe
• Section Shape: Round
• Standard: DIN 2391, En10305-1, En10305-4, BS 6323, ISO 8535
• Delivery Condition: Bk, Gbk, Bkw, Bks or Nbk
• Steel Grade: St35, St37, St37.4, E235, E355, St45, St52.4,etc
• 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
• Trademark: CW
• Origin: China
• HS Code: 7304319000

Product Description

DIN1630 ST37.4 ST44.4 ST52.4 cold drawn precision seamless steel tube

High Precision Seamless Steel Tube for Automotive Industry and Hydraulic 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 in need


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 (%)
Standard	Steel Grade	Material Number	C	Si	Mn	P	S
DIN1629	ST37	1.0254	≤ 0.17	≤ 0.55	≤1.60	≤0.04	≤0.04
	ST44	1.0258	≤ 0.21	≤ 0.55	≤1.60	≤0.04	≤0.04
	ST52	1.0421	≤  0.22	≤ 0.55	≤1.60	≤0.04	≤0.035
DIN1630	ST37.4	1.0255	≤ 0.17	≤ 0.35	≥0.035	≤0.04	≤0.04
	ST44.4	1.0257	≤ 0.21	≤ 0.35	≥0.04	≤0.04	≤0.04
	ST52.4	1.0281	≤ 0.22	≤ 0.55	≤1.60	≤0.04	≤0.035

	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

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

Packaging & Shipping

Company Profile

Chewit international Located in zhangjiagang city which is along The Yangtze Golden Channel the junction of River and Coast Economic Belt. It owns an excellent geographic position, as it is close to Nanjing city in the north, adjacent to Suzhou and Wuxi cities in the south, next to Shanghai international city in the east. Zhangjiagang international port and State highway endow us a convenient water and land transportation which links us to the outside world both home and aboard. Chewit International is one group company with two manufactures one is producing steel forgings for Marine, Power, Boiler, Ocean, Oil, Petrochemical, Mechanical and Hydraulic fields and the other is producing precision steel tubes for automotive industry and hydraulic system and also one semi-independent company specially for import and export business. We have a total area of 150000 square meters with the employees over 200 people. All the products well produced by our mills need to be double inspected by chewit professional quality controller and then we will offer our customer the vivid report for the tested items. Only those products which are inspected well can be allowed to delivery to our customers. By the means of strict inspection, we wined a lot of customer for long term business both home and abroad. We have customers like Danieli, Cedervall,Wartsila,Sannat mansur, SeaLink, Tata Group,  Continental, Iran Khodro and also other well reputated ones. We adhere to our company tenet Customer First, Quality formost and always try our best to serve our customer with our full heart.