{"id":2237,"date":"2021-08-06T06:41:21","date_gmt":"2021-08-06T06:41:21","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2237"},"modified":"2021-08-06T06:41:21","modified_gmt":"2021-08-06T06:41:21","slug":"is-318ln-a-type-duplex-stainless-steel-grades","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/ko\/is-318ln-a-type-duplex-stainless-steel-grades\/","title":{"rendered":"318LN\ub294 \ub450 \ubc30 \uc811\ud569 \uc2a4\ud14c\uc778\ub9ac\uc2a4 \uac15\uc7ac\uc758 \uc885\ub958\uc778\uac00\uc694?"},"content":{"rendered":"

318LN is Nitrogen-enhanced stainless steel commonly used to address corrosion failures in 300 series stainless steel. The structure of 318LN stainless steel is composed of Austenite surrounded by continuous Ferrite phases. 318LN contains about 40-50% Ferrite in the annealed state and can be considered duplex stainless steel. The duplex structure combines ferrite alloys (stress corrosion cracking resistance and high strength) with the superior qualities of Austenitic alloys (ease of manufacture and corrosion resistance). The 318LN is resistant to H2S uniform corrosion, sulfide stress cracking, hydrogen embrittability and pitting, and reducing media corrosion. It is commonly used to manufacture sulfur-resistant wellheads, valves, stems, and fasteners for use in mining environments where H2S partial pressures exceed 1MPa. However, the use of 318LN duplex stainless steel should be limited to less than 600\u00b0F because prolonged high temperatures can brittle the 318LN stainless steel.<\/p>\n

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The chemical composition of 318LN\u00a0steel<\/h3>\n\n\n\n\n
Cr<\/td>\n\ub2c8<\/td>\n\ubaa8<\/td>\nC<\/td>\nN<\/td>\nMn<\/td>\n\uc2dc<\/td>\nP<\/td>\nS<\/td>\n<\/tr>\n
22.0-23.0<\/td>\n4.50-6.50<\/td>\n3.00-3.50<\/td>\n\u22640.030<\/td>\n0.14-0.20<\/td>\n\u22642.00<\/td>\n\u22641.00<\/td>\n\u22640.030<\/td>\n\u22640.020<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n
Mechanical Property<\/td>\n<\/tr>\n
Ys (Mpa)<\/td>\nTs (Mpa)<\/td>\nElongation (%)<\/td>\nHv<\/td>\n<\/tr>\n
Standards<\/td>\n\u2265 450<\/td>\n\u2265 620<\/td>\n\u2265 18<\/td>\n<\/tr>\n
Physical property<\/td>\n<\/tr>\n
Density (g\/cm)<\/td>\nSpecific heat(J\/g.C)<\/td>\nThermal conductivity<\/p>\n

100C(W\/m.)<\/td>\n

The coefficient of thermal expansion<\/p>\n

20~100C (10\/C)<\/td>\n<\/tr>\n

7.8<\/td>\n0.45<\/td>\n19.0<\/td>\n13.7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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Features of 318LNsteel<\/h3>\n