Stainless Steel Grade 302 (UNS S30200)

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.

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

Other Designations

Equivalent materials to grade 302 stainless steel (UNS S30200) are given below.

AMS 5515	AISI 302	AMS 5516	AMS 5636	AMS 5637
AMS 5688	ASME SA240	ASTM A167	ASTM A240	ASTM A276
ASTM A313	ASTM A314	ASTM A368	ASTM A473	ASTM A478
ASTM A479	ASTM A492	ASTM A493	ASTM A511	ASTM A550
ASTM A554	ASTM A666	FED QQ-S-763	FED QQ-S-766	FED QQ-W-423
ASTM A580	MIL SPEC MIL-S-862	SAE 30302	SAE J230	SAE J405
AMS 5788	DIN 1.4319	MIL S-7720	QQ S763	QQ 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

Yaang typically supplies 302 stainless steel in the following forms:

• 302 stainless steel Fittings & 302 stainless steel Flanges
• 302 stainless steel Pipe
• 302 stainless steel Plate
• 302 stainless steel Sheet
• 302 stainless steel U Tube
• 302 stainless steel Bar

Source: Yaang

For more information on this source please visit https://www.yaang.com/ .

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