What is AISI 302 steel?
Grade AISI 302 / 1.4310 is an austenitic stainless steel with a high content of chromium and nickel. A typical application for this stainless steel grade is the industrial production of springs. The material AISI 302 / 1.4310 is suitable for cold forming and owns good polishing qualities.

Grade 302 is a slightly higher carbon version than grade 304. It is widely found in strip and wire forms. It is a standard specification for chromium and chromium-nickel stainless steel sheet, plate, and strip used for pressure vessels and for general applications.

The following datasheet provides an overview of grade 302 stainless steel.

Chemical Composition

The chemical composition of grade 302 stainless steel is outlined in the following table.

Element	Content (%)
Chromium, Cr	17-19
Nickel, Ni	8 - 10
Manganese, Mn	2
Silicon, Si	1.00
Carbon, C	0.15
Sulfur, S	0.03
Phosphorous, P	0.045

Mechanical Properties

The mechanical properties of grade 302 (annealed strip) stainless steel are displayed in the following table.

Properties	Metric	Imperial
Tensile strength	620 MPa	89900 psi
Yield strength (@strain 0.200%)	275 MPa	39900 psi
Elastic modulus	193 GPa	28000 ksi
Poisson's ratio	0.27-0.30	0.27-0.30
Elongation at break (in 50 mm)	55%	55%
Hardness, Brinell (converted from Rockwell B hardness)	147	147
Hardness, Knoop (converted from Rockwell B hardness)	164	164
Hardness, Rockwell B	85	85
Hardness, Vickers (converted from Rockwell B hardness)	147	147

Type 302 Grade Stainless Steel Heat Treatment

• SS 302 annealing temperature is 1010-1120 °C (1850-2050 °F), recommended temperature is 1400 °C (1900 °F)
• Oven stress-relief temperature and time for wire: 345 °C (650 °F), 30 minutes.
• Typical stress relief temperature for SS302 steel spring wire: 425-480 °C (800-900 °F) based on 30 min at temperature, only suitable for stress relief after coiling and not valid for stress relieving after shot peening. When the spring is to be used at a high temperature, the stress relief temperature should be close to the upper limit of this range to minimize relaxation in use. Otherwise, lower temperature are better.
• SS 302 typical forging temperature range is 925-1260 °C (1700-2300 °F).

Welding

SS 302 may be readily welded by friction welding, seam welding and flash welding process; arc welding not recommended. If a filler metal is required, E/ER308 or E/ER308L is recommended.

Heat Resistance

Maximum service temperatures in air

• Intermittent service: 870 °C (1600 °F)
• Continuous service: 925 °C (1700 °F)

Corrosion Resistance

Corrosion of AISI 302 stainless steel in marine environment
AISI Type	Average corrosion rate, mm/year	Average depth of pits, mm (mils)	Appearance
302	<2.5 x 10-5	0.03 (1.2)	Spotted with rust stain on 10% of surface

Applications

AISI 302 stainless steel is widely used in industrial and architectural industries, such as stamping, steel springs, wire rope, metal mesh, woven wire mesh, screen mesh, stainless steel decorative mesh, perforated metal sheet, steel mesh, metal filter and strainer, steel washer, handrail, etc.

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2. Processing and Technology for heating processing

Cutting processing      Quenching              Tempering                  Annealing

       

3. Quality testing

1.      Inspection Institution

Shanghai Fuda Testing Technology Group Co., LTD. Nanjing Branch  

Focus on analysis, testing, testing, r & D four service areas. Analysis fields include component analysis, formula analysis, failure analysis, structure analysis, methodology development and validation, raw material quality control/evaluation, consistency evaluation, feature analysis and other directions; The testing field involves physical and chemical properties testing, toxic and harmful substances testing, flame retardant performance testing, reliability testing and other directions; The testing field involves energy spectrum, electron microscope, spectrum, chromatography, mass spectrometry and other directions; The r&d field involves formula development, formula upgrading, formula customisation, cooperative research and development and other directions.

Beijing Zhongke Chemical Technology Research Institute 

It is a chemical technology research institution based on scientific research and testing. They adhere to paying equal attention to basic research and applied research, and combining applied research and technology transformation, developing into a comprehensive research institute characterised by "task-oriented disciplines". Approved by the relevant national departments, the company has become a third-party analysis and testing technology service unit, and has obtained CMA qualification certification. It has carried out research and development and design, analysis and testing, test and verification, generic processing, information and intellectual property services, providing public services for innovation of technology-based enterprises. Supported by the government innovation Fund, the institute has been awarded as a national high-tech enterprise.

   

2.Inspection Machining

     

   Metal composition testing machine                      Computerised Materials Torsion Testing Machine                Metal bar composite rod bending tensile strength testing machine

       3. Material test certificate

     4. Packaging 

    In the steel export activities, we also need to pack the steel to prevent the steel from being scattered in the transportation process. In the hoisting process, it is necessary to lift the steel. So steel is very necessary in the export process. Below is the picture of packaging：

According to the requirements of the state of steel materials, the use of binding, bare, frame, pallet.

Packing standard: according to the following national standard requirements (the parts beyond the requirements will be specified separately)

GB／T191 packaging-pictorial marking for handling of goods

GB／T4857 (all parts) basic test for transport packages

GB／T4879 rustproof packaging

GB／T5048 damp-proof packing

GB／T7350water-proof packing

GB／T8166 Package cushioning design

GB/T4892-1996  Hard straight square transport packaging size series

GB/T13201-91 Cylinder transport package size series

 GB/T16471-1996Design and make the size limit of transport package 

5. Logistic

       

1. Company profile

Luoyue Precision Metal established in 2018, is a leading Stockists and global distributor for Metal Raw Materials like Steel/Aluminum/ Stainless steel/Copper/ Nickel Rods, Bars, Plates, Sheets,Pipes, fittings, fasteners, Inconel alloys, Wire and Wire-Mesh to customers from aerospace, automotive, electronics, precision manufacturing, ordnance, marine, shipbuilding, oil & gas, power plant and construction.

The company has a high-precision, high-efficiency modern processing site, CNC machine tools and complete testing and inspection technology, and introduces international advanced technologies.

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          3. Our customers 

                 Customer visits 

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FAQ
1. Q: Are you a manufacturer?  
 A:No, we are not manufacturers. We have our own warehouse and our own company. I believe we will be the most suitable supplier for you.  
2. Could we visit your factory?  
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3. Q: Do you have quality control system?  
 A: Yes, we have ISO, BV, SGS certifications and our own quality control laboratory.  
4. Q: Can you arrange the shipment for us?  
 A: Yes, we have designated sea freight and railway freight forwarders with decades of experiences and we get the best  price with earliest vessel and professional service.
5. Q: How long is the delivery time?  
 A: Generally it is 7 days if we have the exact goods in our stock. If not, it will take around 15-20 days to get goods ready for delivery.  
6. Q: Can I get some samples?  
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7. Q: What is your after-sale service?  
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8. Q: What is your MOQ?  
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