{"id":7629,"date":"2026-04-03T09:08:15","date_gmt":"2026-04-03T09:08:15","guid":{"rendered":"https:\/\/www.shandongruiying.com\/?post_type=product&#038;p=7629"},"modified":"2026-04-03T09:08:15","modified_gmt":"2026-04-03T09:08:15","slug":"cold-rolled-steel-coil","status":"publish","type":"product","link":"https:\/\/www.shandongruiying.com\/vi\/san-pham\/cold-rolled-steel-coil\/","title":{"rendered":"Cu\u1ed9n th\u00e9p c\u00e1n ngu\u1ed9i"},"content":{"rendered":"<p>Cu\u1ed9n th\u00e9p c\u00e1n ngu\u1ed9i l\u00e0 s\u1ea3n ph\u1ea9m th\u00e9p c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao, \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o t\u1eeb cu\u1ed9n th\u00e9p c\u00e1n n\u00f3ng th\u00f4ng qua qu\u00e1 tr\u00ecnh c\u00e1n ngu\u1ed9i \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng m\u00e0 kh\u00f4ng c\u1ea7n gia nhi\u1ec7t; \u0111\u00e2y l\u00e0 m\u1ed9t bi\u1ebfn th\u1ec3 quan tr\u1ecdng c\u1ee7a c\u00e1c s\u1ea3n ph\u1ea9m th\u00e9p cacbon, s\u1edf h\u1eefu ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c k\u00edch th\u01b0\u1edbc v\u01b0\u1ee3t tr\u1ed9i. S\u1ea3n ph\u1ea9m n\u00e0y tu\u00e2n th\u1ee7 r\u1ed9ng r\u00e3i c\u00e1c ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf v\u00e0 qu\u1ed1c gia ch\u1ee7 \u0111\u1ea1o, c\u00f3 b\u1ec1 m\u1eb7t nh\u1eb5n m\u1ecbn v\u00e0 \u0111\u1ed3ng \u0111\u1ec1u, dung sai k\u00edch th\u01b0\u1edbc ch\u1eb7t ch\u1ebd, kh\u1ea3 n\u0103ng \u0111\u1ecbnh h\u00ecnh v\u00e0 gia c\u00f4ng v\u01b0\u1ee3t tr\u1ed9i, \u0111\u1ed3ng th\u1eddi l\u00e0 nguy\u00ean li\u1ec7u c\u1ed1t l\u00f5i cho c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p s\u1ea3n xu\u1ea5t v\u00e0 ch\u1ebf bi\u1ebfn \u0111a d\u1ea1ng. S\u1ea3n ph\u1ea9m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00f9y ch\u1ec9nh v\u1edbi c\u00e1c \u0111\u1ed9 d\u00e0y, chi\u1ec1u r\u1ed9ng v\u00e0 ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd b\u1ec1 m\u1eb7t kh\u00e1c nhau theo y\u00eau c\u1ea7u c\u1ee7a kh\u00e1ch h\u00e0ng, ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c c\u00f4ng ngh\u1ec7 gia c\u00f4ng nh\u01b0 d\u1eadp, u\u1ed1n, h\u00e0n v\u00e0 c\u00e1c c\u00f4ng ngh\u1ec7 gia c\u00f4ng kh\u00e1c.<\/p>\n\n<p><strong><b>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh<\/b><\/strong><\/p>\n<ul>\n<li>Ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t tuy\u1ec7t v\u1eddi: B\u1ec1 m\u1eb7t nh\u1eb5n m\u1ecbn v\u00e0 s\u1ea1ch s\u1ebd, kh\u00f4ng c\u00f3 l\u1edbp oxit, v\u1ebft r\u1ed7 hay v\u1ebft n\u1ee9t r\u00f5 r\u1ec7t; c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng tr\u1ef1c ti\u1ebfp cho c\u00e1c c\u00f4ng \u0111o\u1ea1n x\u1eed l\u00fd b\u1ec1 m\u1eb7t nh\u01b0 s\u01a1n, m\u1ea1 \u0111i\u1ec7n v\u00e0 \u00e9p l\u1edbp m\u00e0 kh\u00f4ng c\u1ea7n qua c\u00e1c b\u01b0\u1edbc ti\u1ec1n x\u1eed l\u00fd ph\u1ee9c t\u1ea1p.<\/li>\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c cao v\u1ec1 k\u00edch th\u01b0\u1edbc: Ki\u1ec3m so\u00e1t ch\u1eb7t ch\u1ebd c\u00e1c dung sai v\u1ec1 \u0111\u1ed9 d\u00e0y, chi\u1ec1u r\u1ed9ng v\u00e0 \u0111\u1ed9 ph\u1eb3ng, \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a ng\u00e0nh s\u1ea3n xu\u1ea5t cao c\u1ea5p.<\/li>\n<li>T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc v\u01b0\u1ee3t tr\u1ed9i: C\u00f3 \u0111\u1ed9 b\u1ec1n k\u00e9o v\u00e0 \u0111\u1ed9 c\u1ee9ng cao h\u01a1n so v\u1edbi cu\u1ed9n th\u00e9p c\u00e1n n\u00f3ng, \u0111\u1ed3ng th\u1eddi s\u1edf h\u1eefu \u0111\u1ed9 d\u1ebbo, \u0111\u1ed9 b\u1ec1n va \u0111\u1eadp v\u00e0 kh\u1ea3 n\u0103ng \u0111\u1ecbnh h\u00ecnh t\u1ed1t, ph\u00f9 h\u1ee3p cho c\u00e1c quy tr\u00ecnh gia c\u00f4ng ngu\u1ed9i ph\u1ee9c t\u1ea1p.<\/li>\n<li>Kh\u1ea3 n\u0103ng gia c\u00f4ng t\u1ed1t: D\u1ec5 d\u00e0ng th\u1ef1c hi\u1ec7n c\u00e1c c\u00f4ng \u0111o\u1ea1n gia c\u00f4ng nh\u01b0 d\u1eadp, u\u1ed1n, c\u1eaft, h\u00e0n v\u00e0 c\u00e1c c\u00f4ng \u0111o\u1ea1n gia c\u00f4ng kh\u00e1c, v\u1edbi hi\u1ec7u su\u1ea5t gia c\u00f4ng \u1ed5n \u0111\u1ecbnh v\u00e0 t\u1ef7 l\u1ec7 l\u1ed7i th\u1ea5p.<\/li>\n<li>X\u1eed l\u00fd b\u1ec1 m\u1eb7t c\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh: C\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c quy tr\u00ecnh nh\u01b0 t\u1ea9y axit, b\u00f4i d\u1ea7u, th\u1ee5 \u0111\u1ed9ng h\u00f3a, m\u1ea1 k\u1ebdm, v.v., nh\u1eb1m n\u00e2ng cao kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u1ed9 ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t.<\/li>\n<\/ul>\n<p><strong><b>Quy tr\u00ecnh s\u1ea3n xu\u1ea5t v\u00e0 ch\u1ebf t\u1ea1o<\/b><\/strong><\/p>\n<ul>\n<li>Chu\u1ea9n b\u1ecb nguy\u00ean li\u1ec7u: L\u1ef1a ch\u1ecdn cu\u1ed9n th\u00e9p c\u00e1n n\u00f3ng \u0111\u1ea1t ti\u00eau chu\u1ea9n (d\u1ea3i th\u00e9p cacbon th\u1ea5p l\u00e0m nguy\u00ean li\u1ec7u ch\u00ednh) c\u00f3 th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc \u0111\u1ed3ng nh\u1ea5t v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc \u1ed5n \u0111\u1ecbnh, \u0111\u1ed3ng th\u1eddi ti\u1ebfn h\u00e0nh l\u00e0m s\u1ea1ch b\u1ec1 m\u1eb7t \u0111\u1ec3 lo\u1ea1i b\u1ecf l\u1edbp oxit, v\u1ebft d\u1ea7u m\u1ee1 v\u00e0 t\u1ea1p ch\u1ea5t.<\/li>\n<li>C\u00e1n ngu\u1ed9i: \u0110\u01b0a cu\u1ed9n th\u00e9p c\u00e1n n\u00f3ng \u0111\u00e3 qua x\u1eed l\u00fd s\u01a1 b\u1ed9 qua m\u00e1y c\u00e1n ngu\u1ed9i \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n qu\u00e1 tr\u00ecnh c\u00e1n nhi\u1ec1u l\u1ea7n, \u0111i\u1ec1u ch\u1ec9nh \u00e1p su\u1ea5t v\u00e0 t\u1ed1c \u0111\u1ed9 c\u00e1n nh\u1eb1m gi\u1ea3m \u0111\u1ed9 d\u00e0y c\u1ee7a d\u1ea3i th\u00e9p xu\u1ed1ng k\u00edch th\u01b0\u1edbc danh \u0111\u1ecbnh, t\u1eeb \u0111\u00f3 t\u1ea1o th\u00e0nh cu\u1ed9n th\u00e9p c\u00e1n ngu\u1ed9i ban \u0111\u1ea7u.<\/li>\n<li>X\u1eed l\u00fd \u1ee7: Ti\u1ebfn h\u00e0nh \u1ee7 li\u00ean t\u1ee5c \u0111\u1ed1i v\u1edbi cu\u1ed9n th\u00e9p c\u00e1n ngu\u1ed9i sau khi c\u00e1n nh\u1eb1m lo\u1ea1i b\u1ecf hi\u1ec7n t\u01b0\u1ee3ng c\u1ee9ng do c\u00e1n ngu\u1ed9i g\u00e2y ra, kh\u00f4i ph\u1ee5c \u0111\u1ed9 d\u1ebbo v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a th\u00e9p, \u0111\u1ed3ng th\u1eddi \u0111i\u1ec1u ch\u1ec9nh c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u \u1ee9ng d\u1ee5ng kh\u00e1c nhau.<\/li>\n<li>L\u00e0m ph\u1eb3ng v\u00e0 c\u1eaft d\u1ecdc: Ti\u1ebfn h\u00e0nh x\u1eed l\u00fd l\u00e0m ph\u1eb3ng cu\u1ed9n th\u00e9p \u0111\u00e3 \u1ee7 \u0111\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 ph\u1eb3ng; c\u1eaft cu\u1ed9n th\u00e9p th\u00e0nh c\u00e1c cu\u1ed9n c\u00f3 chi\u1ec1u r\u1ed9ng theo y\u00eau c\u1ea7u c\u1ee7a kh\u00e1ch h\u00e0ng b\u1eb1ng m\u00e1y c\u1eaft d\u1ecdc.<\/li>\n<li>Ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t: Th\u1ef1c hi\u1ec7n c\u00e1c quy tr\u00ecnh x\u1eed l\u00fd b\u1ec1 m\u1eb7t nh\u01b0 t\u1ea9y axit, b\u00f4i d\u1ea7u ho\u1eb7c th\u1ee5 \u0111\u1ed9ng h\u00f3a theo y\u00eau c\u1ea7u c\u1ee7a s\u1ea3n ph\u1ea9m nh\u1eb1m t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 ng\u0103n ng\u1eeba r\u1ec9 s\u00e9t trong qu\u00e1 tr\u00ecnh l\u01b0u kho v\u00e0 v\u1eadn chuy\u1ec3n.<\/li>\n<li>Ki\u1ec3m tra v\u00e0 cu\u1ed9n th\u00e9p: Ti\u1ebfn h\u00e0nh ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng nghi\u00eam ng\u1eb7t \u0111\u1ed1i v\u1edbi cu\u1ed9n th\u00e9p th\u00e0nh ph\u1ea9m (bao g\u1ed3m \u0111o k\u00edch th\u01b0\u1edbc, th\u1eed nghi\u1ec7m t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc, ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t); sau khi \u0111\u1ea1t ti\u00eau chu\u1ea9n ki\u1ec3m tra, ti\u1ebfn h\u00e0nh cu\u1ed9n v\u00e0 \u0111\u00f3ng g\u00f3i s\u1ea3n ph\u1ea9m \u0111\u1ec3 l\u01b0u kho v\u00e0 giao h\u00e0ng.<\/li>\n<\/ul>\n<p><strong><b>Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt s\u1ea3n ph\u1ea9m<\/b><\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Tham s\u1ed1<\/b><\/strong><\/td>\n<td><strong><b>Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt<\/b><\/strong><\/td>\n<td><strong><b>S\u1ef1 khoan dung<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed9 d\u00e0y<\/td>\n<td>0,10 mm \u2013 3,00 mm (C\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh)<\/td>\n<td>\u00b10,005 mm \u2013 \u00b10,02 mm (t\u00f9y thu\u1ed9c v\u00e0o \u0111\u1ed9 d\u00e0y)<\/td>\n<\/tr>\n<tr>\n<td>Chi\u1ec1u r\u1ed9ng<\/td>\n<td>100 mm \u2013 1.500 mm (C\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh)<\/td>\n<td>\u00b10,5 mm \u2013 \u00b12,0 mm (t\u00f9y theo chi\u1ec1u r\u1ed9ng)<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u01b0\u1eddng k\u00ednh trong\/\u0111\u01b0\u1eddng k\u00ednh ngo\u00e0i cu\u1ed9n d\u00e2y<\/td>\n<td>\u0110\u01b0\u1eddng k\u00ednh trong: 508 mm\/610 mm; \u0110\u01b0\u1eddng k\u00ednh ngo\u00e0i: \u22642000 mm<\/td>\n<td>C\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh<\/td>\n<\/tr>\n<tr>\n<td>Tr\u1ecdng l\u01b0\u1ee3ng m\u1ed7i cu\u1ed9n<\/td>\n<td>3 t\u1ea5n \u2013 15 t\u1ea5n (C\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh)<\/td>\n<td>\u00b10,5 t<\/td>\n<\/tr>\n<tr>\n<td>Tr\u1ea1ng th\u00e1i b\u1ec1 m\u1eb7t<\/td>\n<td>T\u1ea9m d\u1ea7u, ng\u00e2m axit, x\u1eed l\u00fd th\u1ee5 \u0111\u1ed9ng, kh\u00f4ng x\u1eed l\u00fd (C\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh)<\/td>\n<td>Kh\u00f4ng c\u00f3 khuy\u1ebft t\u1eadt r\u00f5 r\u00e0ng, b\u1ec1 m\u1eb7t nh\u1eb5n m\u1ecbn<\/td>\n<\/tr>\n<tr>\n<td>Ti\u00eau chu\u1ea9n d\u00e0nh cho l\u00e3nh \u0111\u1ea1o<\/td>\n<td>GB\/T 708-2019, ASTM A1008, EN 10130, JIS G3141<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong><b>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc (wt%, cu\u1ed9n th\u00e9p c\u00e1n ngu\u1ed9i h\u00e0m l\u01b0\u1ee3ng carbon th\u1ea5p)<\/b><\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td><strong><b>Y\u1ebfu t\u1ed1<\/b><\/strong><\/td>\n<td><strong><b>H\u00e0m l\u01b0\u1ee3ng (T\u1ef7 l\u1ec7 kh\u1ed1i l\u01b0\u1ee3ng)<\/b><\/strong><\/td>\n<\/tr>\n<tr>\n<td>Cacbon (C)<\/td>\n<td>\u22640,20%<\/td>\n<\/tr>\n<tr>\n<td>Silic (Si)<\/td>\n<td>\u22640,50%<\/td>\n<\/tr>\n<tr>\n<td>Mangan (Mn)<\/td>\n<td>0.30% &#8211; 1.60%<\/td>\n<\/tr>\n<tr>\n<td>Ph\u1ed1t pho (P)<\/td>\n<td>\u22640,045%<\/td>\n<\/tr>\n<tr>\n<td>L\u01b0u hu\u1ef3nh (S)<\/td>\n<td>\u22640,045%<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed3ng (Cu)<\/td>\n<td>\u22640,30%<\/td>\n<\/tr>\n<tr>\n<td>S\u1eaft (Fe)<\/td>\n<td>C\u00e2n b\u1eb1ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong><b>C\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/b><\/strong><\/p>\n<ul>\n<li>S\u1ea3n xu\u1ea5t thi\u1ebft b\u1ecb gia d\u1ee5ng: V\u1ecf v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn k\u1ebft c\u1ea5u c\u1ee7a t\u1ee7 l\u1ea1nh, m\u00e1y gi\u1eb7t, \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed, l\u00f2 vi s\u00f3ng, v.v., \u0111\u00f2i h\u1ecfi ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t cao v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c v\u1ec1 k\u00edch th\u01b0\u1edbc.<\/li>\n<li>Ng\u00e0nh c\u00f4ng nghi\u1ec7p \u00f4 t\u00f4: C\u00e1c t\u1ea5m th\u00e2n xe, c\u00e1c b\u1ed9 ph\u1eadn khung g\u1ea7m, c\u00e1c chi ti\u1ebft trang tr\u00ed n\u1ed9i th\u1ea5t v\u00e0 ngo\u1ea1i th\u1ea5t, ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c quy tr\u00ecnh d\u1eadp v\u00e0 t\u1ea1o h\u00ecnh ph\u1ee9c t\u1ea1p.<\/li>\n<li>X\u00e2y d\u1ef1ng &amp; Trang tr\u00ed: Khung th\u00e9p nh\u1eb9, t\u1ea5m \u1ed1p trang tr\u00ed, khung c\u1eeda v\u00e0 khung c\u1eeda s\u1ed5, c\u00f3 kh\u1ea3 n\u0103ng \u0111\u1ecbnh h\u00ecnh t\u1ed1t v\u00e0 b\u1ec1 m\u1eb7t ho\u00e0n thi\u1ec7n \u0111\u1eb9p.<\/li>\n<li>S\u1ea3n xu\u1ea5t m\u00e1y m\u00f3c: C\u00e1c b\u1ed9 ph\u1eadn ch\u00ednh x\u00e1c, ph\u1ee5 ki\u1ec7n kim lo\u1ea1i, v\u1ecf thi\u1ebft b\u1ecb, \u0111\u00f2i h\u1ecfi \u0111\u1ed9 ch\u00ednh x\u00e1c gia c\u00f4ng cao v\u00e0 c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc t\u1ed1t.<\/li>\n<li>Ng\u00e0nh c\u00f4ng nghi\u1ec7p \u0111i\u1ec7n t\u1eed v\u00e0 \u0111i\u1ec7n: V\u1ecf t\u1ee7 \u0111i\u1ec7n, linh ki\u1ec7n \u0111i\u1ec7n t\u1eed, gi\u00e1 \u0111\u1ee1 t\u1ea3n nhi\u1ec7t, c\u00f3 k\u00edch th\u01b0\u1edbc \u1ed5n \u0111\u1ecbnh v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n t\u1ed1t.<\/li>\n<li>Ng\u00e0nh c\u00f4ng nghi\u1ec7p bao b\u00ec: V\u1eadt li\u1ec7u bao b\u00ec kim lo\u1ea1i nh\u01b0 v\u1eadt li\u1ec7u n\u1ec1n thi\u1ebfc m\u1ea1 k\u1ebdm, gia c\u00f4ng th\u00e2n lon v\u00e0 n\u1eafp lon.<\/li>\n<\/ul>\n<p><strong><b>C\u00e1c ti\u00eau chu\u1ea9n \u00e1p d\u1ee5ng<\/b><\/strong><\/p>\n<ul>\n<li>Ti\u1ebfng Trung: GB\/T 708-2019, GB\/T 3280 (\u0111\u1ed1i v\u1edbi cu\u1ed9n th\u00e9p kh\u00f4ng g\u1ec9 c\u00e1n ngu\u1ed9i)<\/li>\n<li>Ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf: ASTM A1008, ASTM A653<\/li>\n<li>Ti\u00eau chu\u1ea9n ch\u00e2u \u00c2u: EN 10130, EN 10025<\/li>\n<li>Ti\u1ebfng Nh\u1eadt: JIS G3141, JIS G3131<\/li>\n<\/ul>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Cu\u1ed9n th\u00e9p c\u00e1n ngu\u1ed9i l\u00e0 m\u1ed9t s\u1ea3n ph\u1ea9m th\u00e9p c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao, \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o t\u1eeb cu\u1ed9n th\u00e9p c\u00e1n n\u00f3ng th\u00f4ng qua qu\u00e1 tr\u00ecnh c\u00e1n ngu\u1ed9i \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng m\u00e0 kh\u00f4ng c\u1ea7n gia nhi\u1ec7t; 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