Topone 302 Stainless Steel Spring Wire
Standard：ASTM A313, JIS G4314, EN 10270-3 and Other Equivalents.
Grade:SS302, AISI302,S30200, SUS302,1.4300
Diameter: 0.30-16.0mm
Surface: Bright/Matt (Soap Coated)
Temper:1/2 Hard, 3/4 Hard, Full Hard
Packing: Separate Mill Coils, Coils on Pallet, Coil on Carrier，Carrier-Less Core
MOQ：500kg
Characteristics:
Excellent straightness & helix with good cast;
Uniform & beautiful surface condition;
High elasticity and high fatigue resistance;
Different corrosion-resistances are optional against exposures to different environment with different grades
Ningbo Huayuan Metal Prouducts Co., Ltd. manufactures high quality stainless steel spring wire from 0.30 – 12.00 mm in bright as well as in stearate coated surface finish.
Stainless steel spring wires can be supplied in ½ hard, ¾ hard & full hard conditions as well. We are using drawing lubricants from TRAXIT and also of Japanese origin.
Description
Type 302 is an austenitic stainless steel capable of attaining high strengths and ductility by cold working and 302 is a general purpose stainless alloy typically composed of 18% chromium and 8% nickel. It is the most widely used stainless spring wire because of its high corrosion resistance properties and good tensile strength. For spring applications it is generally furnished in the cold drawn condition. Type 302 springs have good strength at moderate temperatures. If properly treated after forming they will set less than most other spring materials at temperatures up to 500ºF. Type 302 material in the spring condition is slightly magnetic due to the transformation of some martinsite in the drawing operation. The greater the amount of cold reduction the higher the degree of magnetism.
APPLICATIONS
Stainless steel spring wires are used for producing various types of springs like aerosol spring, Compression spring, Extension spring, and
Torsion spring as well as for wire form, Straight Pin etc.
STANDARDS
The stainless steel wires are manufactured as per ASTM A 313, EN 10270-3, JIS G4314, BS 2056 & DIN 17224 and other equivalent international standards.
SURFACE FINISH
|
Size (mm) |
Finish
|
|
0.30 – 3.0
|
Bright
|
|
0.30 – 16.0
|
Soap Coated
|
CHEMICAL ANALYSIS
|
Element
|
EN 10270-3
(Requirement) |
Typical values
|
|
%C
|
0.05 – 0.15
|
0.090
|
|
%Mn
|
2.00 Max
|
1.150
|
|
%Si
|
2.00 Max
|
0.400
|
|
%P
|
0.045 Max
|
0.025
|
|
%S
|
0.015 Max
|
0.002
|
|
%Cr
|
16.00 - 19.00
|
17.500
|
|
%Ni
|
6.00 – 9.50
|
8.100
|
|
%Mo
|
0.80 Max
|
0.100
|
|
%N
|
0.11 Max
|
0.050
|
PHYSICAL PROPERTIES
|
Density (200C)
|
7.9 g/cm3
|
|
Thermal conductivity (200C)
|
14.6 W/m.K.
|
|
Specific heat (200C)
|
500 J/Kg.K
|
|
Electrical resistivity (200C)
|
0.73 Ωmm2/m
|
|
Permeability (μmax)
|
10 Approx.
|
|
Shear modulus
|
|
|
As drawn: 71 GPa approx
|
Tempered: 73 GPa approx
|
| Modulus of elasticity | |
|
As drawn: 185 GPa approx
|
Tempered: 193 GPa approx
|
| Thermal expansion coefficient | |
|
200 – 2000 C
|
16.5
|
|
200 – 4000 C
|
17.5
|
|
200 – 6000 C
|
18.5
|
Data shown are typical, and should not be construed as max & min values for specification. Data on any particular piece of material may vary from those shown herein.
MECHANICAL PROPERTIES
Mechanical properties of supplied wire (As drawn condition) as per EN 10270-3: 2001 are mentioned below.
| Tensile strength as per EN 10270-3 | |||
| Size(mm) | Tensile Strength(MPa) | ||
| From | To | Nominal TS(min) | High TS(min) |
| 0.30 | 0.40 | 2100 | 2250 |
| 0.40 | 0.50 | 2050 | 2200 |
| 0.50 | 0.65 | 2000 | 2150 |
| 0.65 | 0.80 | 1950 | 2100 |
| 0.80 | 1.00 | 1900 | 2050 |
| 1.00 | 1.25 | 1850 | 2000 |
| 1.25 | 1.50 | 1800 | 1950 |
| 1.50 | 1.75 | 1750 | 1900 |
| 1.75 | 2.00 | 1700 | 1850 |
| 2.00 | 2.50 | 1650 | 1750 |
| 2.50 | 3.00 | 1600 | 1700 |
| 3.00 | 3.50 | 1550 | 1650 |
| 3.50 | 4.25 | 1500 | 1600 |
| 4.25 | 5.00 | 1450 | 1550 |
| 5.00 | 6.00 | 1400 | 1500 |
| 6.00 | 7.00 | 1350 | 1450 |
| 7.00 | 8.50 | 1300 | 1400 |
| 8.50 | 10.00 | 1250 | 1350 |
After straightening, TS may be reduced by up to 10%
1 MPa = 1 N/mm2.
When better formability required or in case of thicker sizes, Tensile strength values may be agreed upon.
HEAT TREATMENT
Tensile strength values of drawn wire may be increased by about 150 – 250 MPa by tempering at 3500C / 3 – 20 Minutes.
Tempering effect will be more if greater holding time is used. In case of very short holding periods temperature may be raised up to 4200C.
This tempering treatment also affects the Yield strength/Tensile strength ratio. In as drawn condition this ratio is about 0.80 & after tempering treatment, the same would be around 0.85.
E-mail: sales@toponewire.com
Tel: +86-574-88328001
Fax: +86-574-88328008
Add: No. 72 Longxing Road, Wuxiang Industrial Zone, Ningbo, Zhejiang,P.R.China
Post Code: 315111
