Dom Welded Steel Tube Cold Drawn Smooth Id Tolerance For Shock Absorbers

Product Description

 

EN10305-2 DOM Pipe for Motorcycle Shock Absorbers

 

 

EN10305-2 Welded Precision Cold Drawn Steel Tubes

Applications: for Auto industry/for machinery use/Oil Cylinder Tube/Motorcycle shock absorber
Auto shock absorber inner cylinder/Telescopic Cylinders

Size range: O.D.:6-350mm W.T.:1-35mm L:max12000mm

 

Characteristic:High precision with smooth ID tolerance and roughness

 

Steel Grade and Chemical Compositions

Steel Grade		C	Si	Mn	P	S
Steel name	Steel number	max	max	max	max	max
E155	1.0033	0.11	0.35	0.70	0.025	0.025
E195	1.0034	0.15	0.35	0.70	0.025	0.025
E235	1.0308	0.17	0.35	1.20	0.025	0.025
E275	1.0225	0.21	0.35	1.40	0.025	0.025
E355	1.0580	0.22	0.35	1.60	0.025	0.025

 

Mechanical properties at room temperature
Steel Grade		Minimum values for the delivery conditiona b
Steel Name		(+Cc)		(+LCc)		(+SR)			(+Ad)		(+N)
		Rm Mpa	A %	Rm Mpa	A %	Rm Mpa	ReH Mpa	A %	Rm Mpa	A %	Rm Mpa	ReHe Mpa	A %
E155	1.0033	400	6	350	10	350	245	18	260	28	270-410	155	28
E195	1.0034	420	6	370	10	370	260	18	290	28	300-440	195	28
E235	1.0308	490	6	440	10	440	325	14	315	25	340-480	235	25
E275	1.0225	560	5	510	8	510	375	12	390	21	410-550	275	21
E355	1.0580	640	4	590	6	590	435	10	450	22	490-630	355	22

aRm: tensile strength; ReH: upper yield strength; A: elongation after fracture
b 1Mpa=1N/mm2
c Depending on the degree of cold work in the finishing pass the yield strength may nearly be as high as the tensile strength.
For calculation purposes the following relations are recommended:
for delivery condition +C: ReH ≥0.8 Rm
for delivery condition +LC: ReH ≥0.7 Rm
d For calculation purposes the following relation is recommended:ReH≥0.5Rm
e For tubes with outside diameter ≤30mm and wall thickness ≤3mm the ReH minimum values are 10Mpa lower than the values given in this Table
Note: Special steel grade is also available, according to customer request.

 

For Application of:

EN10305-2 Welded Steel Tubes with Precision Cold Drawn Steel Tubes for Mechanical / Automotive Application

 

 

EN10305-2 Welded Precision Cold Drawn Steel Tubes
Applications: for Auto industry/for Machinery use/Oil Cylinder Tube/Motorcyle Shock Absorber, inner cylinder/Telescopic Cylinders

 

Quick Detail:
Size Range: O.D.:6-350mm W.T.:1-35mm L:max12000mm

Steel Grade: E195, E237, E275, E355,

 

Description:

ERW+ DOM

The tubes are manufactured from electric welded pre-tubes by cold drawing or other suitable processes.

The tubes not include welds used for joining lengths of flat rolled strips prior to forming the pre-tube

 

Description:

Mechanical tubing made from hot or cold-rolled steel.

Covers electric-resistance-welded low carbon steel tubing for use as mechanical tubing

 

Advantage:

Good concentricity, Better price than seamless.

 

Steel Grade and Chemical Compositions

Steel Grade		C	Si	Mn	P	S
Steel Name	Steel Number	max	max	max	max	max
E155	1.0033	0.11	0.35	0.70	0.025	0.025
E195	1.0034	0.15	0.35	0.70	0.025	0.025
E235	1.0308	0.17	0.35	1.20	0.025	0.025
E275	1.0225	0.21	0.35	1.40	0.025	0.025
E355	1.0580	0.22	0.35	1.60	0.025	0.025

 

Mechanical properties at room temperature
Steel Grade		Minimum values for the delivery condition a b
Steel Name		(+Cc)		(+LCc)		(+SR)			(+Ad)		(+N)
		Rm Mpa	A %	Rm Mpa	A %	Rm Mpa	ReH Mpa	A %	Rm Mpa	A %	Rm Mpa	ReHe Mpa	A %
E155	1.0033	400	6	350	10	350	245	18	260	28	270-410	155	28
E195	1.0034	420	6	370	10	370	260	18	290	28	300-440	195	28
E235	1.0308	490	6	440	10	440	325	14	315	25	340-480	235	25
E275	1.0225	560	5	510	8	510	375	12	390	21	410-550	275	21
E355	1.0580	640	4	590	6	590	435	10	450	22	490-630	355	22

 

aRm: tensile strength; ReH: upper yield strength; A: elongation after fracture
b 1Mpa=1N/mm2
c Depending on the degree of cold work in the finishing pass the yield strength may nearly be as high as the tensile strength.
For calculation purposes the following relations are recommended:
for delivery condition +C: ReH ≥0.8 Rm
for delivery condition +LC: ReH ≥0.7 Rm
d For calculation purposes the following relation is recommended:ReH≥0.5Rm
e For tubes with outside diameter ≤30mm and wall thickness ≤3mm the ReH minimim values are 10Mpa lower than the values given in this Table
Note: Special steel grade is also available, according to customer request.

 

Applications:

Auto industry/for Machinery use/Oil Cylinder Tube/Motorcycle Shock Absorber

inner cylinder/Telescopic Cylinders

 

Competitive Advantage:

Good source of raw material from Bao Steel.

Prompt delivery time according to PO and agreement.

Produce exactly according to standard and customer's requirement.

Experienced export team for customer service, quick reply within 24 hours.

 

Production Site:

 

 

 

 

Test Methods:

Tensile test

 

Flattening test

 

Drift expanding test

 

Dimensional inspection

 

Roughness measurement

 

Visual examincation

 

Not-destructive testing

a. Test for longitudinal imperfections-

- Eddy current test - EN10246-3, level E3

- ultrasonic testing - EN10246-7, level U3

 

b. Leak-tightness

- Non-destructive testing for verification of leak-tightness shall be carried out in accordance with EN10246-1

 

 

EN10305 Consists of the following Parts under the general title " Steel tubes for precision applications - Technical delivery conditions "

 

Part 1: Seamless Cold Drawn Tubes

 

Part 2: Welded Cold Drawn Tubes

 

Part 3: Welded Cold Sized Tubes

 

Part 4: Seamless Cold Drawn Tubes for Hydraulic and Pneumatic Power Systems

 

Part 5: Welded and Cold Sized Square and Rectangular Tubes

 

Part 6: Welded Cold Drawn Tubes for Hydraulic and Pneumatic Power Systems

 

Normative references:

 

EN10002-1, Metallic materials - Tensile Testing - Part 1: Method of test at ambient temperature

 

EN10020, Definition and classification of grades of steel

 

EN10021, General technical delivery requirements for steel and iron products

 

EN10027-1, Designation systems for steel - Part 1 : Steel names, principal symbols

 

EN10027-2, Designation systems for steel - Part 2: Numerical systems

 

EN10052, Vocabulary of heat treatment terms for ferrous products.

 

EN10204, Metallic products - Types of inspection documents

 

EN10233, Metallic materials - Tube - Flattening Test

 

EN10234, Metallic materials - Tube - Drift expanding test

 

EN10246-1, Non-destructive testing of steel tubes - Part 1: Automatic electromagnetic testing of seamless and welded ( except submerged arc-welded) ferromagnetic steel tubes for verification of hydraulic leak-tightness

 

EN10246-3, Non-destructive testing of steel tubes - Part 3: Automatic eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections

 

EN10246-5, Non-destructive testing of steel tubes - Part 5: Automatic full peripheral magnetics transducer/flux leakage testing of seamless and welded ( expcept submerged arc-welded) ferromagnetic steel tubes for the detection of longitudinal imperfections

 

EN10246-7, Non-destructive testing of steel tubes - Qualification and competence of level 1 and 2 non-destructive testing personnel.

 

EN ISO377, Steel and Steel products - Location and preparation of samples and test pieces for mechanical testing (ISO 377:1997)

 

EN ISO 2566-1, Steel - Conversion of elongation values - Part 1: Carbon and Low alloy steels (EN102566-1:1984)

 

EN 10168, Iron and steel products - Inspection documents - List information and description

 

ENV10220, Seamless and welded steel tubes - Dimensions and masses per unit length

 

EN10266, Steel Tubes, fittings and structural hollow sections - Definitions and symbols for use in product standards

 

EN ISO 4287, Geometrical product specifications (GPS) - Surface Texture: Profile method - Terms, definition and surface texture parameters ( ISO 4287:1997)