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                304/304L Stainless Steel

                2018-01-23 20:47:06

                304/304L Stainless Steel

                电子游戏登录注册304 Stainless is a low carbon (0.08% max) version of basic 18-8 also known as 302. Type 302 has 18% chromium and 8% nickel.

                Type 304 has slightly lower strength than 302 due to its lower carbon content. Type 304 finds extensive use in welding applications because the low carbon permits some exposure in the carbide precipitation range of 800°F - 1500°F without the need for post-annealing operations. However, the severity of corrosive environments may necessitate annealing after welding or the use of 304L.

                电子游戏登录注册Type 304L has a carbon content of 0.03% or less. This alloy can be used in the as-welded condition without becoming susceptible to intergranular corrosion.

                Specifications - Stainless Steel 304/304L
                • ASTM:A312, A376,A358, A269,A249, A403, A182, A351

                • 电子游戏登录注册ASME: SA312, SA376, Pressure SA358,SA269, SA249,SA403, SA182, SA351

                Chemical Composition - Stainless Steel 304/304L
                ElementPercentage by Weight Maximum Unless Range is Specified
                304304L304H
                Carbon0.080.0300.04-0.10
                Manganese2.002.002.00
                Phosphorus0.0450.0450.045
                Sulfur0.0300.0300.030
                Silicon0.750.750.75
                Chromium18.00
                20.00
                18.00
                20.00
                18.00
                20.00
                Nickel8.0
                10.50
                8.0
                12.00
                8.0
                10.5
                Nitrogen0.100.100.10
                304 Resistance To Corrosion
                Grade317317L
                UNS DesignationS31700S31703
                Carbon (C) Max.0.080.035*
                Manganese (Mn) Max.2.002.00
                Phosphorous (P) Max.0.0400.04
                Sulphur (S) Max.0.030.03
                Silicon (Si) Max.1.001.00
                Chromium (Cr)18.0–20.018.0–20.0
                Nickel (Ni)11.0–14.011.0–15.0
                Molybdenum (Mo)3.0–4.03.0–4.0
                Nitrogen (N)
                Iron (Fe)Bal.Bal.
                Other Elements

                *Maximum carbon content of 0.04% acceptable for drawn tubes

                Typical Mechanical Properties-Stainless Steel 304/304L
                GradeTensile Strength Rm N/mm²
                Yield Strength Rp 0.2, N/mm²Elongation (%)
                304 Annealed500-70019540
                304L Annealed460-68018040


                Design Features - Stainless Steel 304/304L
                • 电子游戏登录注册Oxidation resistance up to 1650°F for continuous service and up to 1500°F where cyclic heating is involved.

                • General purpose corrosion resistance.

                • Non-hardenable except by cold working.

                • 电子游戏登录注册Non-magnetic except when cold worked.

                • May be susceptible to chloride stress corrosion cracking.

                • 电子游戏登录注册Used where field working is employed.

                Typical Applications - Stainless Steel 304/304L
                • Sanitary

                • Dairy and food processing

                • 电子游戏登录注册Heat exchangers, evaporators

                • 电子游戏登录注册Feedwater heaters

                Tensile Requirements - Stainless Steel 304/304L
                • Tensile Strength (KSI): 70

                • Yield Strength (KSI): 25

                Each alloy represents an excellent combination of corrosion resistance and fabricability. This combination of properties is the reason for the extensive use of these alloys which represent nearly one half of the total U.S. stainless steel production. The 18-8 stainless steels, principally Alloys 304, 304L, and 304H, are available in a wide range of product forms including sheet, strip, and plate. The alloys are covered by a variety of specifications and codes relating to, or regulating, construction or use of equipment manufactured from these alloys for specific conditions. Food and beverage, sanitary, cryogenic, and pressure-containing applications are examples.

                电子游戏登录注册Alloy 304 is the standard alloy since AOD technology has made lower carbon levels more easily attainable and economical. Alloy 304L is used for welded products which might be exposed to conditions which could cause intergranular corrosion in service.

                Alloy 304H is a modification of Alloy 304 in which the carbon content is controlled to a range of 0.04-0.10 to provide improved high temperature strength to parts exposed to temperatures above 800°F.


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