{"id":2117,"date":"2021-03-19T08:51:44","date_gmt":"2021-03-19T08:51:44","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2117"},"modified":"2021-03-19T08:51:44","modified_gmt":"2021-03-19T08:51:44","slug":"stainless-steel-321-vs-347","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/vi\/stainless-steel-321-vs-347\/","title":{"rendered":"Th\u00e9p kh\u00f4ng g\u1ec9 321 VS 347"},"content":{"rendered":"

T\u00ednh ch\u1ea5t c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 321 v\u00e0 th\u00e9p kh\u00f4ng g\u1ec9 347 l\u00e0 t\u01b0\u01a1ng t\u1ef1 nhau trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, th\u00e9p kh\u00f4ng g\u1ec9 321 l\u00e0 m\u1ed9t lo\u1ea1i titan \u2013 t\u00ednh \u1ed5n \u0111\u1ecbnh c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 austenit 18\/8 (304), m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf titan t\u1ea1o th\u00e0nh d\u1ea3i nhi\u1ec7t \u0111\u1ed9 k\u1ebft t\u1ee7a cacbua , \u0111\u00f3 l\u00e0 425-850oC, kh\u00f4ng xu\u1ea5t hi\u1ec7n s\u1ef1 \u0103n m\u00f2n gi\u1eefa c\u00e1c h\u1ea1t sau khi nung, c\u00f3 \u0111\u1ed9 b\u1ec1n t\u1ed1t, kh\u1ea3 n\u0103ng ch\u1ed1ng bong tr\u00f3c oxy h\u00f3a v\u00e0 ch\u1ed1ng \u0103n m\u00f2n n\u01b0\u1edbc.<\/p>\n

321H l\u00e0 phi\u00ean b\u1ea3n carbon cao c\u1ee7a 321 v\u1edbi \u0111\u1ed9 b\u1ec1n nhi\u1ec7t \u0111\u1ed9 cao cao h\u01a1n v\u00e0 ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c \u1ee9ng d\u1ee5ng nhi\u1ec7t \u0111\u1ed9 cao kho\u1ea3ng 900\u00b0C. Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a 321 l\u00e0 titan c\u00f3 kh\u1ea3 n\u0103ng chuy\u1ec3n ti\u1ebfp h\u1ed3 quang h\u00e0n k\u00e9m n\u00ean kh\u00f4ng th\u1ec3 d\u00f9ng l\u00e0m v\u1eadt li\u1ec7u h\u00e0n, trong khi 347 ch\u1ee9a niobi c\u0169ng \u0111\u00f3ng vai tr\u00f2 \u1ed5n \u0111\u1ecbnh cacbua v\u00e0 c\u0169ng c\u00f3 th\u1ec3 truy\u1ec1n qua h\u1ed3 quang h\u00e0n. 347 l\u00e0 v\u1eadt li\u1ec7u h\u00e0n ti\u00eau chu\u1ea9n \u0111\u1ec3 h\u00e0n th\u00e9p kh\u00f4ng g\u1ec9 321 v\u00e0 \u0111\u00f4i khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m kim lo\u1ea1i c\u01a1 b\u1ea3n. Ch\u00fang ta h\u00e3y xem so s\u00e1nh h\u00f3a h\u1ecdc v\u00e0 c\u01a1 h\u1ecdc c\u1ee7a h\u1ecd d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n

 <\/p>\n

So s\u00e1nh th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/strong><\/p>\n\n\n\n\n\n
\u0110i\u1ec3m<\/td>\nC<\/td>\nMn<\/td>\nS\u0129<\/td>\nP<\/td>\nS<\/td>\nCr<\/td>\nNi<\/td>\nM\u01a1<\/td>\nN<\/td>\nKh\u00e1c<\/td>\n<\/tr>\n
321<\/td>\n0.08<\/td>\n2.00<\/td>\n0.75<\/td>\n0.045<\/td>\n0.03<\/td>\n17.0-19.0<\/td>\n9.0-12.0<\/td>\n\/<\/td>\n0.1<\/td>\nTi=5(C+N)0,7<\/td>\n<\/tr>\n
347<\/td>\n0.08<\/td>\n2.00<\/td>\n0.75<\/td>\n0.045<\/td>\n0.03<\/td>\n17.0-19.0<\/td>\n9.0-13.0<\/td>\n\/<\/td>\n\/<\/td>\nNb=10(C+N)1,0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa ch\u00fang l\u00e0 vi\u1ec7c b\u1ed5 sung Ti v\u00e0 Nb. Do b\u1ed5 sung titan nguy\u00ean t\u1ed1 \u1ed5n \u0111\u1ecbnh, 321 c\u00f3 th\u1ec3 ch\u1ed1ng l\u1ea1i s\u1ef1 h\u00ecnh th\u00e0nh cacbua crom \u1edf 426oC ~ 815oC, do \u0111\u00f3, n\u00f3 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n gi\u1eefa c\u00e1c h\u1ea1t tuy\u1ec7t v\u1eddi v\u00e0 hi\u1ec7u su\u1ea5t nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 c\u00f3 \u0111\u1eb7c t\u00ednh \u0111\u1ee9t g\u00e3y v\u00e0 \u1ee9ng su\u1ea5t leo cao h\u01a1n 304 v\u00e0 304L. Ngo\u00e0i ra, 321 c\u00f2n c\u00f3 \u0111\u1ed9 d\u1ebbo dai \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p t\u1ed1t, kh\u1ea3 n\u0103ng t\u1ea1o h\u00ecnh v\u00e0 h\u00e0n tuy\u1ec7t v\u1eddi, kh\u00f4ng b\u1ecb \u1ee7 sau khi h\u00e0n.<\/p>\n

Th\u00e9p kh\u00f4ng g\u1ec9 347 l\u00e0 th\u00e9p kh\u00f4ng g\u1ec9 Austenitic c\u00f3 ch\u1ee9a niobi v\u00e0 347H l\u00e0 phi\u00ean b\u1ea3n c\u00f3 h\u00e0m l\u01b0\u1ee3ng carbon cao. 347 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c coi l\u00e0 phi\u00ean b\u1ea3n b\u1ed5 sung niobi d\u1ef1a tr\u00ean 304. Nb, m\u1ed9t nguy\u00ean t\u1ed1 \u0111\u1ea5t hi\u1ebfm, c\u00f3 t\u00e1c d\u1ee5ng t\u01b0\u01a1ng t\u1ef1 nh\u01b0 titan trong qu\u00e1 tr\u00ecnh tinh ch\u1ebf ng\u0169 c\u1ed1c, c\u00f3 th\u1ec3 ch\u1ed1ng l\u1ea1i s\u1ef1 \u0103n m\u00f2n gi\u1eefa c\u00e1c h\u1ea1t v\u00e0 th\u00fac \u0111\u1ea9y qu\u00e1 tr\u00ecnh c\u1ee9ng l\u1ea1i do l\u00e3o h\u00f3a.<\/p>\n

 <\/p>\n

So s\u00e1nh t\u00ednh ch\u1ea5t v\u1eadt l\u00fd<\/strong><\/p>\n\n\n\n\n\n
\u0110i\u1ec3m<\/td>\n\u0110\u1ed9 b\u1ec1n k\u00e9o, Mpa<\/td>\nS\u1ee9c m\u1ea1nh n\u0103ng su\u1ea5t, Mpa<\/td>\n\u0110\u1ed9 gi\u00e3n d\u00e0i (50mm)<\/td>\n\u0110\u1ed9 c\u1ee9ng, HB<\/td>\n<\/tr>\n
321<\/td>\n515<\/td>\n205<\/td>\n40<\/td>\n217<\/td>\n<\/tr>\n
347<\/td>\n515<\/td>\n205<\/td>\n40<\/td>\n201<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

C\u00e1c \u1ee9ng d\u1ee5ng ti\u00eau bi\u1ec3u<\/strong><\/p>\n

Th\u00e9p kh\u00f4ng g\u1ec9 347 & 347H c\u00f3 hi\u1ec7u su\u1ea5t nhi\u1ec7t \u0111\u1ed9 cao t\u1ed1t h\u01a1n 304 v\u00e0 321. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong ng\u00e0nh h\u00e0ng kh\u00f4ng, h\u00f3a d\u1ea7u, th\u1ef1c ph\u1ea9m, s\u1ea3n xu\u1ea5t gi\u1ea5y v\u00e0 c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c, nh\u01b0 \u1ed1ng x\u1ea3 v\u00e0 \u1ed1ng nh\u00e1nh c\u1ee7a \u0111\u1ed9ng c\u01a1 m\u00e1y bay, \u1ed1ng d\u1eabn kh\u00ed n\u00f3ng c\u1ee7a m\u00e1y n\u00e9n tuabin v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn ho\u1ea1t \u0111\u1ed9ng d\u01b0\u1edbi t\u1ea3i th\u1ea5p v\u00e0 nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng qu\u00e1 850oC.<\/p>\n

Vi\u1ec7c b\u1ed5 sung titan v\u00e0o 321 l\u00e0m cho n\u00f3 ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi nh\u1eefng n\u01a1i c\u1ea7n nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng ch\u1ed1ng \u0103n m\u00f2n t\u1ed1t. N\u00f3 ph\u00f9 h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng 304 nh\u1ea1y c\u1ea3m v\u00e0 304L kh\u00f4ng \u0111\u1ee7 \u0111\u1ed9 b\u1ec1n nhi\u1ec7t \u0111\u1ed9 cao. C\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh bao g\u1ed3m c\u00e1c khe co gi\u00e3n nhi\u1ec7t, \u1ed1ng th\u1ed5i, c\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a h\u1ec7 th\u1ed1ng x\u1ea3 m\u00e1y bay, c\u00e1c \u1ed1ng b\u1ecdc b\u1ed9 ph\u1eadn l\u00e0m n\u00f3ng, c\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a l\u00f2 v\u00e0 b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t.<\/p>","protected":false},"excerpt":{"rendered":"

T\u00ednh ch\u1ea5t c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 321 v\u00e0 th\u00e9p kh\u00f4ng g\u1ec9 347 l\u00e0 t\u01b0\u01a1ng t\u1ef1 nhau trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, th\u00e9p kh\u00f4ng g\u1ec9 321 l\u00e0 m\u1ed9t lo\u1ea1i titan \u2013 t\u00ednh \u1ed5n \u0111\u1ecbnh c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 austenit 18\/8 (304), m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf titan t\u1ea1o th\u00e0nh d\u1ea3i nhi\u1ec7t \u0111\u1ed9 k\u1ebft t\u1ee7a cacbua , \u0111\u00f3 l\u00e0 425-850oC, kh\u00f4ng xu\u1ea5t hi\u1ec7n s\u1ef1 \u0103n m\u00f2n gi\u1eefa c\u00e1c h\u1ea1t sau khi nung, c\u00f3 \u0111\u1ed9 b\u1ec1n t\u1ed1t, [\u2026]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2117","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/posts\/2117","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/comments?post=2117"}],"version-history":[{"count":2,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/posts\/2117\/revisions"}],"predecessor-version":[{"id":2119,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/posts\/2117\/revisions\/2119"}],"wp:attachment":[{"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/media?parent=2117"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/categories?post=2117"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wldstainless.com\/vi\/wp-json\/wp\/v2\/tags?post=2117"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}