Stainless Steel 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 flanges, pipe, and bar 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 (UNS S30200) is outlined in the following table.ElementContent (%)Chromium, Cr17-19Nickel, Ni8 – 10Manganese, Mn2Silicon, Si1.00Carbon, C0.15Sulfur, S0.03Phosphorous, P0.045
Mechanical Properties
The mechanical properties of grade 302 (annealed strip) stainless steel are displayed in the following table.PropertiesMetricImperialTensile strength620 MPa89900 psiYield strength (@strain 0.200%)275 MPa39900 psiElastic modulus193 GPa28000 ksiPoisson’s ratio0.27-0.300.27-0.30Elongation at break (in 50 mm)55%55%Hardness, Brinell (converted from Rockwell B hardness)147147Hardness, Knoop (converted from Rockwell B hardness)164164Hardness, Rockwell B8585Hardness, Vickers (converted from Rockwell B hardness)147147
Other Designations
Equivalent materials to grade 302 stainless steel (UNS S30200) are given below.AMS 5515AISI 302AMS 5516AMS 5636AMS 5637AMS 5688ASME SA240ASTM A167ASTM A240ASTM A276ASTM A313ASTM A314ASTM A368ASTM A473ASTM A478ASTM A479ASTM A492ASTM A493ASTM A511ASTM A550ASTM A554ASTM A666FED QQ-S-763FED QQ-S-766FED QQ-W-423ASTM A580MIL SPEC MIL-S-862SAE 30302SAE J230SAE J405AMS 5788DIN 1.4319MIL S-7720QQ S763QQ S766
Manufacturing Process
Grade 302 Stainless Steel requires slow speeds, and high feeds will aid in overcoming this alloy’s tendency to work harden. It is recommended that chip breakers are used on all tooling due to the occurrence of gummy chips. While welding Stainless Steel grade 302, it is recommended that resistance or shielded fusion methods are used. The filler metals to be used are AWS E/ER308 or 312. Post weld annealing is performed when the chromium carbide needs to be dissolved so as to provide maximum resistance to inter-granular attack. Forging is ideally performed at these temperatures – 1149-1260°C (2100-2300°F). It is advisable not to forge below 927°C (1700°F). Forgings should be fully annealed after all operations so as to maintain full corrosion resistance.
Hot working requires uniform heating to 1149°C (2100°F) while cold working helps to increase the hardness of this material. Stainless Steel Grade 302 is quite ductile and can be readily drawn, spun and upset. Cold working causes this alloy to gain magnetic properties, and hence post-fabrication annealing is required to recover maximum corrosion resistance and a non-magnetic condition. Annealing is performed between 1010 and 1121°C (1850 and 2050°F) with fast cooling so as to avoid precipitation of chromium carbides.
Applications
Grade 302 stainless steel is widely used in the stamping, spinning and wire forming industry.
This alloy is also used in:
Chemical processing, transport and storage
Oil and gas exploration and offshore rigs
Oil and gas refining
Marine environments
Pollution control equipment
Pulp & paper manufacturing
Chemical process plant
Supplied Forms
wilsonpipeline typically supplies 302 stainless steel in the following forms:
302 stainless steel Fittings & 302 stainless steel Flanges
302 stainless steel Plate
302 stainless steel Sheet
302 stainless steel U Tube
302 stainless steel Bar
Source: wilsonpipeline
For more information on this source please visit https://www.wilsonpipeline.com/ .
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