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High Hardness 302 Stainless Steel By Yaang™ Pipe Industry
by yane Yang Sales ManagerYaang™ 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.
Applications
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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About yane Yang 
Sales Manager
144 connections, 0 recommendations, 658 honor points.Joined APSense since, June 7th, 2014, From wenzhou, China.
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