Tham khảo tài liệu 'stainless steel manual part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 113 114 UNS S31600 Type 316 UNS S31609 Type 316H Type 316 is an austenitic chromium-nickel-molybdenum stainless steel with corrosion resistance superior to most other chromiumnickel stainless steels in many types of chemical corrodents as well as marine atmospheres. It also has higher tensile and creep strengths at elevated temperatures than the conventional 18 chromium-8 nickel alloys. Austenitic Type 316H is a modification of Type 316 where the carbon is controlled to a range of to to provide improved high temperature strength. Typical applications include parts exposed to temperatures above 800 F 425 C such as powerplant superheater tubing. See also the Section on Typical Applications. UNSS31600 S31609 Chemical Composition Limits Cast or Heat Analysis Percent c Mn p 5 Si Cr Ni Mo N Type 316 Max Max Max Max Max Max Type316H Max Max Max Max Max Physical Properties in the Annealed Condition Modulus of Elasticity in Tension3 psi_MPa 106 1 93 000 Density lb in3 kz m3 8 027 Electrical Resistivity Microhm mm at 68 F 20 C 740 Specific Heat Btu lb F kJ kz-K 32-212 F 0-100 C Melting Range F C 2500-2550 1371-1399 Magnetic Permeability H m Annealed Max Thermal Conductivity Btu ft h F W mK 212 F 100 C 932 F 500 C Mean Coefficient of Expansion in in F cm cm C 32-212 F X IO 6 0-100 C X IO 6 32-600 F X 10 6 0-315 C X IO 6 32-1000 F X 10 6 o-538 c X 10 6 32-1200 F X 10 6 0-649 C X IO 6 32-1500 F X 10 6 o-815 c X 10 6 Thermal Treatment Initial Forging F__ C 2100-2300 1149-1259 Annealing F__ C 1850-2050 1008-1120 Annealing Cool rapidly from these temperatures. Hardening Hardenable by cold work only. As cold worked the modulus is lowered. By stress relief heat treatment the lowered modulus may be increased. 115 UNSS31600 .
