Ss 304 304l_data_sheet
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Type 304 and 304L stainless steels are austenitic alloys with high chromium and nickel contents. Type 304L has a lower maximum carbon content of 0.03% compared to 0.08% for Type 304, which eliminates carbide precipitation from welding and allows use in the as-welded condition. Both alloys exhibit excellent corrosion resistance and can be formed or welded using common techniques, with Type 304L requiring less post-weld heat treatment.
Ss 304 304l_data_sheet
- 1. P R O D U C T D A T A S H E E T 304/304L-S-8-01-07 AK Steel Type 304 is a variation of the basic 18-8 grade, Type 302, with a higher chromium and lower carbon content. Lower carbon minimizes chromium car- bide precipitation due to welding and its susceptibility to intergranular corrosion. In many instances, it can be used in the ”as-welded“ condition, while Type 302 must be annealed in order to retain adequate corrosion resistance. Type 304L is an extra low-carbon varia- tion of Type 304 with a 0.03% maximum carbon content that eliminates carbide precipitation due to welding. As a result, this alloy can be used in the ”as-welded“ condition, even in severe corrosive con- ditions. It often eliminates the necessity of annealing weldments except for applications specifying stress relief. It has slightly lower mechanical properties than Type 304. Typical uses include architectural moul- dings and trim, kitchen equipment, welded components of chemical, textile, paper, pharmaceutical and chemical industry processing equipment. AVAILABLE FORMS AK Steel produces Type 304 Stainless Steel in thicknesses from 0.01" to 0.25" (0.025 to 6.35 mm) max. and widths up to 48" (1219 mm). For other thicknesses and widths, inquire. MECHANICAL PROPERTIES Typical Room Temperature Mechanical Properties Elongation UTS 0.2% YS % in 2" Hardness ksi (MPa) ksi (MPa) (50.8 mm) Rockwell Type 304L 85 (586) 35 (241) 55 B80 Type 304 90 (621) 42 (290) 55 B82 COMPOSITION Type 304 Type 304L % % Carbon 0.08 max. 0.03 max. Manganese 2.00 max. 2.00 max. Phosphorus 0.045 max. 0.045 max. Sulfur 0.030 max. 0.030 max. Silicon 0.75 max. 0.75 max. Chromium 18.00-20.00 18.0-20.0 Nickel 8.00-12.00 8.0-12.0 Nitrogen 0.10 max. 0.10 max. Iron Balance Balance SPECIFICATIONS AK Steel Types 304 and 304L Stainless Steels are covered by the following specifications: Type 304 Type 304L AMS 5513 AMS 5511 ASTM A 240 ASTM A 240 ASTM A 666 ASTM A 666 STAINLESS STEEL 304 304LUNS S30400/UNS S30403
- 2. 304/304LSTAINLESSSTEELDATASHEET The information and data in this product data sheet are accurate to the best of our knowledge and belief, but are intended for general information only. Applications suggested for the materials are described only to help readers make their own evaluations and decisions, and are neither guarantees nor to be construed as express or implied warranties of suitability for these or other applications. Data referring to mechanical properties and chemical analyses are the result of tests performed on specimens obtained from specific locations with prescribed sampling procedures; any warranty thereof is limited to the values obtained at such locations and by such procedures. There is no warranty with respect to values of the materials at other locations. AK Steel and the AK Steel logo are registered trademarks of AK Steel Corporation. PHYSICAL PROPERTIES Density, 0.29 lbs/in3 8.03 g/cm3 Electrical Resistivity, microhm-in (microhm-cm) 68°F (20°C) – 28.4 (72) 1200°F(659°C) – 45.8 (116) Specific Heat, BTU/lb/°F (kJ/kg•K) 32 - 212°F (0 - 100°C) – 0.12 (0.50) Thermal Conductivity, BTU/hr/ft2 /ft/°F (W/m•K) at 212°F (100°C) – 9.4 (16.2) at 932°F (500°C) – 12.4 (21.4) Mean Coefficient of Thermal Expansion, in/in/°F (μm/m•K) 32- 212°F (0 - 100°C) – 9.4 x 10-6 (16.9) 32- 600°F (0 - 315°C) – 9.6 x 10-6 (17.3) 32-1000°F (0 - 538°C) –10.2x10-6 (18.4) 32-1200°F (0 - 649°C) –10.4 x10-6 (18.7) Magnetic Permeability, H = 200 Oersteds, Annealed - 1.02 max. Modulus of Elasticity, ksi (MPa) 28.0 x 103 (193 x 103 ) in tension 11.2 x 103 ( 78 x 103 ) in torsion Melting Range, °F (°C) – 2550 - 2650 (1399 - 1454) CORROSION RESISTANCE These steels exhibit excellent resistance to a wide range of atmospheric, chemi- cal, textile, petroleum and food industry exposures. OXIDATION RESISTANCE The maximum temperature to which Types 304 and 304L can be exposed continuously without appreciable scaling is about 1650°F (899°C). For intermittent exposure, the maximum exposure temperature is about 1500°F (816°C). HEAT TREATMENTS Type 304 is non-hardenable by heat treat- ment. Annealing: Heat to 1900 - 2050°F (1038 - 1121°C), then cool rapidly. Thin strip sections may be air cooled, but heavy sections should be water quenched to minimize exposure in the carbide precipitation region. Stress Relief Annealing: Cold worked parts should be stress relieved at 750°F (399°C) for 1/2 to 2 hours. FORMABILITY Types 304 and 304L have very good drawability. Their combination of low yield strength and high elongation permits successful forming of complex shapes. However, these grades work harden rapidly. To relieve stresses pro- duced in severe forming or spinning, parts should be full annealed or stress- relief annealed as soon as possible after forming. WELDABILITY The austenitic class of stainless steels is generally considered to be weldable by the common fusion and resistance AKSTEEL techniques. Special consideration is re- quired to avoid weld ”hot cracking“ by assuring formation of ferrite in the weld deposit. Types 304 and 304L are generally considered to be the most common al- loys of this stainless class. When a weld filler is needed, AWS E/ER 308, 308L or 347 are most often specified. Types 304 and 304L Stainless Steels are well known in reference literature and more information can be obtained in this way. METRIC CONVERSION Data in this publication are presented in U.S. customary units. Approximate metric equivalents may be obtained by performing the following calculations: Length (inches to millimeters) – Multiply by 25.4 Strength (ksi to megapascals or meganewtons per square meter) – Multiply by 6.8948 Temperature (Fahrenheit to Celsius) – (°Fahrenheit - 32) Multiply by 0.5556 Density (pounds per cubic inch to kilograms per cubic meter) – Multiply by 27,670 7100-0096 7/07© 2007 AK Steel Corporation 9227 Centre Pointe Drive AK Steel Corporation West Chester, OH 45069 www.aksteel.com Customer Service 800-331-5050