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High Hardness 302 Stainless Steel By Yaang™ Pipe Industry

High Hardness 302 Stainless Steel By Yaang™ Pipe Industry

Yaang Pipe Industry is a well-established company that specializes in nickel alloy and stainless steel products. The company offers high quality 302 stainless steel, which exhibits excellent hardness and are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries. Table 1 shows the typical chemistry of different elements. The chemistry is for reference only, and must not be employed for specification purposes. Table 2 gives the physical properties of the 302 alloy, and Table 3 the mechanical properties.

Table 1. Typical chemistry of different elements

  Yaang Avg. Wt. % ASTM A313
Carbon 0.10 0.12
Manganese 1.11 2.00
Silicon 0.52 1.00
Phosphorus 0.023 0.045
Sulfur 0.002 0.030
Chromium 18.60 17.0-19.0
Nickel 8.40 8.00-10.00
Molybdenum 0.32
Copper 0.36
Nitrogen 0.03 0.10
Iron Balance Balance
Cobalt 0.16

Table 2. Physical properties of 302 alloy

Density 0.285 lbs/in3
Modulus Of Elasticity 28.0 psi x 106
Electrical Resistivity 720 µohms-mm
Thermal Conductivity 16.3 W/mK (100°C)

Table 3. Mechanical properties of 302 alloy

%CW Y.S.(psi) U.T.S.(psi) % Elongation (10″ gauge length)
0% 49,000 106,000 48%
20% 125,000 147,000 9.8%
37% 169,000 189,000 3.2%
50% 196,000 220,000 2.6%
60% 222,000 244,000 2.2%
68% 243,000 273,000 2.1%
75% 251,000 289,000 2.4%
80% 282,000 309,000 2.2%
84% 295,000 327,000 2.2%
87% 300,000 332,000 2.3%
90% 319,000 345,000 2.2%
92% 322,000 371,000 2.5%

Thermal Treatment

Cold worked 302 alloy in wire form will acquire tensile strength when they are stress relieved from 350°C to 427°C for a period of 4 to 6 h. Here, a reducing atmosphere is usually used, but inert gas can also be employed. The 302 alloy can be fully annealed at 1010-1121°C for a short period of time. However, the corrosion resistance of the alloy is significantly reduced due to carbide precipitation that occurs between 427°C and 899°C. Nonetheless, a test method has been described by the American Society for Testing Materials (ASTM) which ensures that the alloy is not damaged.

Surface Condition

Since stainless steels are drawn to fine diameters, they tend to develop a highly polished appearance. When single crystal natural diamond (SCND) dies are utilized to process alloys, the surface roughness can be below 5 RMS. Alloys with more than 0.040” diameters are finished by means of polycrystalline dies and tend to have a rougher surface than those processed with natural diamond dies. Similarly, alloys with more than 0.100″ diameters will exhibit an even rougher surface as they are drawn with carbide dies.


302 alloy is like 304 alloy, apart from the 0.12% carbon maximum. The maximum percentage of carbon in 304 alloy is 0.08%. In principle, all 304 alloys fulfill the requirements of 302 alloy, but not all 302 alloys meet 304 alloy chemistry. This means, despite the same amount of cold work, 302 is comparatively harder than 304. The end products of 302 alloys include Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe.

About Yaang Pipe Industry

Established in 2008, Zhejiang Yaang Pipe Industry Co., Limited is a professional organizer and one-stop-shop supplier for steel piping system products, including stainless steel pipes and tubes, forged stainless steel flanges and stainless steel fittings, butt-welding stainless steel pipe fittings, stainless steel elbow, stainless steel tee, stainless steel reducer, stainless steel stub end, stainless steel gaskets, stainless steel fasteners, stainless steel valves, Sanitary Services etc. in China. We have devoted to providing the best solutions of steel materials and industrial equipment for our respected customers.

We supply not only commonly used stainless steel materials (SS304/L,SS316/L,SS321), but also duplex and super duplex steel 1.4547, 1.4462, 1.4410 (S31254,S31803,S32750,S32760), special austenite stainless 310S, 347H, 317L, 904L… Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining,Sewage treatment, Natural gas and Pressure vessels and other industries.

Yaang products are according to national standard GB/T12459, GB/T13401, U.S. standard ANSI/ASME B16.9, ANSI/ASME B16.5/B16.47, ANSI/ASME B16.11, ANSI/ASME B36.19M/ B36.10M, ASME B16.20,British standard BS,Germany standard DIN,Japan standard JIS…, The purpose built nonstandard or special use products as per customer’s demand,  we will try our best to satisfy it.

To be a reliable supplier, providing high quality products,very best service and support, Yaang will do that always!

Zhejiang Yaang Pipe Industry Co., Limited 

Contact Person : Ms. Yane 

 Job Title : sales manager 

Business Phone :+86-18267732328 

 Skype :skaifox 

Email :sales@yaang.com 

Website: www.yaang.com

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www.yaang.com provide a wide range of steel products as Steel pipe, Steel pipes and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.

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