{"id":5564,"date":"2025-12-19T08:41:51","date_gmt":"2025-12-19T08:41:51","guid":{"rendered":"https:\/\/korea-transmission.com\/?p=5564"},"modified":"2025-12-19T08:41:51","modified_gmt":"2025-12-19T08:41:51","slug":"mechanical-performance-standards-for-self-tapping-screws-per-gb-t3098-7-2000","status":"publish","type":"post","link":"https:\/\/korea-transmission.com\/vi\/blog\/mechanical-performance-standards-for-self-tapping-screws-per-gb-t3098-7-2000\/","title":{"rendered":"Ti\u00eau chu\u1ea9n v\u1ec1 hi\u1ec7u su\u1ea5t c\u01a1 h\u1ecdc cho v\u00edt t\u1ef1 ren theo ti\u00eau chu\u1ea9n GB\/T3098.7-2000"},"content":{"rendered":"
\n

Ti\u00eau chu\u1ea9n GB\/T3098.7-2000 quy \u0111\u1ecbnh c\u00e1c \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc c\u1ee7a v\u00edt t\u1ef1 ren l\u00e0m t\u1eeb th\u00e9p t\u00f4i cacbon. Ti\u00eau chu\u1ea9n n\u00e0y \u0111\u1ea3m b\u1ea3o c\u00e1c lo\u1ea1i \u1ed1c v\u00edt n\u00e0y \u0111\u00e1p \u1ee9ng c\u00e1c ti\u00eau ch\u00ed hi\u1ec7u su\u1ea5t nghi\u00eam ng\u1eb7t cho c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u ren ch\u1eafc ch\u1eafn v\u00e0 \u0111\u1ed9 b\u1ec1n cao. D\u01b0\u1edbi \u0111\u00e2y, ch\u00fang t\u00f4i tr\u00ecnh b\u00e0y chi ti\u1ebft c\u00e1c kh\u00eda c\u1ea1nh ch\u00ednh v\u1ec1 v\u1eadt li\u1ec7u, \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc, ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m v\u00e0 c\u00e1c y\u00eau c\u1ea7u li\u00ean quan.<\/p>\n

Nguy\u00ean v\u1eadt li\u1ec7u<\/h2>\n

V\u00edt t\u1ef1 ren ph\u1ea3i \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o t\u1eeb th\u00e9p t\u00f4i cacbon b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p d\u1eadp ngu\u1ed9i. Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc \u0111\u01b0\u1ee3c cung c\u1ea5p trong B\u1ea3ng 1 \u0111\u00f3ng vai tr\u00f2 l\u00e0 h\u01b0\u1edbng d\u1eabn.<\/p>\n\n\n\n\n\n\n
B\u1ea3ng 1: Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/caption>\n
Ph\u00e2n t\u00edch<\/th>\nCacbon (%)<\/th>\nMangan (%)<\/th>\n<\/tr>\n<\/thead>\n
Mu\u1ed7ng m\u00fac<\/td>\n0.15~0.25<\/td>\n0.70~1.65<\/td>\n<\/tr>\n
Ki\u1ec3m tra<\/td>\n0.13~0.27<\/td>\n0.64~1.71<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

L\u01b0u \u00fd: H\u00e0m l\u01b0\u1ee3ng boron c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1edbi 0,005% n\u1ebfu \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t b\u1eb1ng c\u00e1ch th\u00eam titan v\u00e0\/ho\u1eb7c nh\u00f4m \u0111\u1ec3 l\u00e0m cho n\u00f3 kh\u00f4ng c\u00f2n t\u00e1c d\u1ee5ng.<\/p>\n

T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc v\u00e0 hi\u1ec7u n\u0103ng<\/h2>\n

4.1 T\u00ednh ch\u1ea5t v\u00e0 ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m<\/h3>\n

C\u00e1c \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc v\u00e0 hi\u1ec7u n\u0103ng, c\u00f9ng v\u1edbi c\u00e1c y\u00eau c\u1ea7u v\u00e0 ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m, \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y chi ti\u1ebft trong B\u1ea3ng 2.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
B\u1ea3ng 2: T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc v\u00e0 hi\u1ec7u n\u0103ng<\/caption>\n
T\u00e0i s\u1ea3n<\/th>\nY\u00eau c\u1ea7u (\u0110i\u1ec1u kho\u1ea3n ho\u1eb7c B\u1ea3ng)<\/th>\nPh\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m (\u0110i\u1ec1u kho\u1ea3n)<\/th>\n<\/tr>\n<\/thead>\n
\u0110\u1ed9 c\u1ee9ng l\u00f5i<\/td>\n4.3<\/td>\n5.1<\/td>\n<\/tr>\n
\u0110\u1ed9 c\u1ee9ng b\u1ec1 m\u1eb7t<\/td>\n4.3<\/td>\n5.2<\/td>\n<\/tr>\n
\u0110\u1ed9 s\u00e2u tr\u01b0\u1eddng h\u1ee3p<\/td>\n4.4, B\u1ea3ng 4<\/td>\n5.3<\/td>\n<\/tr>\n
S\u1ee9c b\u1ec1n xo\u1eafn<\/td>\n4.5, B\u1ea3ng 3<\/td>\n5.4<\/td>\n<\/tr>\n
\u0110\u1ea7u kh\u1ecfe<\/td>\n4.6<\/td>\n5.5<\/td>\n<\/tr>\n
Kh\u1ea3 n\u0103ng l\u00e1i xe<\/td>\n4.7, B\u1ea3ng 3<\/td>\n5.6<\/td>\n<\/tr>\n
Kh\u1ea3 n\u0103ng ch\u1ed1ng gi\u00f2n hydro<\/td>\n4.8<\/td>\n5.7<\/td>\n<\/tr>\n
\u0110\u1ed9 c\u1ee9ng l\u00f5i sau khi t\u00f4i l\u1ea1i<\/td>\n4.9<\/td>\n5.8<\/td>\n<\/tr>\n
\u0110\u1ed9 b\u1ec1n k\u00e9o<\/td>\n4.10, B\u1ea3ng 3<\/td>\n5.9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4.2 X\u1eed l\u00fd nhi\u1ec7t<\/h3>\n

C\u00e1c v\u00edt th\u00e0nh ph\u1ea9m ph\u1ea3i tr\u1ea3i qua qu\u00e1 tr\u00ecnh t\u00f4i c\u1ee9ng b\u1ec1 m\u1eb7t v\u00e0 ram nhi\u1ec7t. Nhi\u1ec7t \u0111\u1ed9 ram t\u1ed1i thi\u1ec3u l\u00e0 340\u00b0C, v\u00e0 ch\u00fang ph\u1ea3i \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u v\u1ec1 c\u01a1 h\u1ecdc v\u00e0 hi\u1ec7u n\u0103ng trong B\u1ea3ng 3.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
B\u1ea3ng 3: Y\u00eau c\u1ea7u v\u1ec1 c\u01a1 kh\u00ed v\u00e0 hi\u1ec7u n\u0103ng<\/caption>\n
\u0110\u01b0\u1eddng k\u00ednh ren danh ngh\u0129a (mm)<\/th>\nC\u01b0\u1eddng \u0111\u1ed9 xo\u1eafn t\u1ed1i thi\u1ec3u (N\u00b7m)<\/th>\nM\u00f4-men xo\u1eafn truy\u1ec1n \u0111\u1ed9ng t\u1ed1i \u0111a (N\u00b7m)<\/th>\nT\u1ea3i tr\u1ecdng k\u00e9o t\u1ed1i thi\u1ec3u (tham chi\u1ebfu) (N)<\/th>\n<\/tr>\n<\/thead>\n
2<\/td>\n0.5<\/td>\n0.3<\/td>\n1940<\/td>\n<\/tr>\n
2.5<\/td>\n1.2<\/td>\n0.6<\/td>\n3150<\/td>\n<\/tr>\n
3<\/td>\n2.1<\/td>\n1.1<\/td>\n4680<\/td>\n<\/tr>\n
3.5<\/td>\n3.4<\/td>\n1.7<\/td>\n6300<\/td>\n<\/tr>\n
4<\/td>\n4.9<\/td>\n2.5<\/td>\n8170<\/td>\n<\/tr>\n
5<\/td>\n10<\/td>\n5<\/td>\n13200<\/td>\n<\/tr>\n
6<\/td>\n17<\/td>\n8.5<\/td>\n18700<\/td>\n<\/tr>\n
8<\/td>\n42<\/td>\n21<\/td>\n34000<\/td>\n<\/tr>\n
10<\/td>\n85<\/td>\n43<\/td>\n53900<\/td>\n<\/tr>\n
12<\/td>\n150<\/td>\n75<\/td>\n78400<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4.3 \u0110\u1ed9 c\u1ee9ng<\/h3>\n

\u0110\u1ed9 c\u1ee9ng l\u00f5i ph\u1ea3i \u0111\u1ea1t 290~370 HV10, v\u00e0 \u0111\u1ed9 c\u1ee9ng b\u1ec1 m\u1eb7t t\u1ed1i thi\u1ec3u ph\u1ea3i l\u00e0 450 HV0.3.<\/p>\n

4.4 \u0110\u1ed9 s\u00e2u v\u1ecf<\/h3>\n

\u0110\u1ed9 s\u00e2u c\u1ee7a l\u1edbp v\u1ecf ph\u1ea3i tu\u00e2n th\u1ee7 B\u1ea3ng 4.<\/p>\n\n\n\n\n\n\n\n\n\n
B\u1ea3ng 4: \u0110\u1ed9 s\u00e2u c\u1ee7a ca b\u1ec7nh<\/caption>\n
\u0110\u01b0\u1eddng k\u00ednh ren danh ngh\u0129a (mm)<\/th>\nT\u1ed1i thi\u1ec3u (mm)<\/th>\nT\u1ed1i \u0111a (mm)<\/th>\n<\/tr>\n<\/thead>\n
2, 2.5<\/td>\n0.04<\/td>\n0.12<\/td>\n<\/tr>\n
3, 3.5<\/td>\n0.05<\/td>\n0.18<\/td>\n<\/tr>\n
4, 5<\/td>\n0.1<\/td>\n0.25<\/td>\n<\/tr>\n
6, 8<\/td>\n0.15<\/td>\n0.28<\/td>\n<\/tr>\n
10, 12<\/td>\n0.15<\/td>\n0.32<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4.5 \u0110\u1ed9 b\u1ec1n xo\u1eafn<\/h3>\n

Khi \u0111\u01b0\u1ee3c ki\u1ec3m tra theo m\u1ee5c 5.4, \u0111\u1ed9 b\u1ec1n xo\u1eafn ph\u1ea3i \u0111\u00e1p \u1ee9ng B\u1ea3ng 3. Kh\u00f4ng \u0111\u01b0\u1ee3c x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng g\u00e3y \u1edf ph\u1ea7n ren \u0111\u01b0\u1ee3c k\u1eb9p ch\u1eb7t.<\/p>\n

4.6 \u0110\u1ed9 l\u00e0nh m\u1ea1nh c\u1ee7a \u0111\u1ea7u<\/h3>\n

Khi th\u1eed nghi\u1ec7m theo m\u1ee5c 5.5, kh\u00f4ng \u0111\u01b0\u1ee3c xu\u1ea5t hi\u1ec7n v\u1ebft n\u1ee9t t\u1ea1i ch\u1ed7 n\u1ed1i gi\u1eefa \u0111\u1ea7u v\u00e0 th\u00e2n v\u00edt khi b\u1ec1 m\u1eb7t ch\u1ecbu l\u1ef1c c\u1ee7a \u0111\u1ea7u v\u00edt bi\u1ebfn d\u1ea1ng v\u0129nh vi\u1ec5n th\u00e0nh g\u00f3c 7\u00b0 so v\u1edbi m\u1eb7t ph\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi tr\u1ee5c v\u00edt. Th\u1eed nghi\u1ec7m \u0111\u1ea1t n\u1ebfu \u0111\u1ea7u v\u00edt kh\u00f4ng b\u1ecb g\u00e3y, ngay c\u1ea3 khi x\u1ea3y ra g\u00e3y \u1edf ren \u0111\u1ea7u ti\u00ean.<\/p>\n

4.7 Kh\u1ea3 n\u0103ng t\u1ea1o ren<\/h3>\n

C\u00e1c v\u00edt kh\u00f4ng b\u1ecb bi\u1ebfn d\u1ea1ng ren v\u0129nh vi\u1ec5n (\u0111\u01b0\u1ee3c ki\u1ec3m tra d\u01b0\u1edbi \u0111\u1ed9 ph\u00f3ng \u0111\u1ea1i 10x) ph\u1ea3i t\u1ea1o \u0111\u01b0\u1ee3c ren trong kh\u1edbp v\u1edbi t\u1ea5m th\u1eed theo m\u1ee5c 5.6. M\u00f4-men xo\u1eafn khi v\u1eb7n kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 c\u00e1c gi\u00e1 tr\u1ecb trong B\u1ea3ng 3. Ren trong \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh ph\u1ea3i ch\u1ea5p nh\u1eadn ren ngo\u00e0i theo ti\u00eau chu\u1ea9n GB\/T 197 v\u1edbi dung sai 6h v\u00e0 ch\u1ecbu \u0111\u01b0\u1ee3c t\u1ea3i tr\u1ecdng th\u1eed nghi\u1ec7m cho c\u1ea5p \u0111\u1ed9 b\u1ec1n 8 theo ti\u00eau chu\u1ea9n GB\/T 3098.2.<\/p>\n

4.8 Kh\u1ea3 n\u0103ng ch\u1ed1ng gi\u00f2n hydro<\/h3>\n

\u1ed0c v\u00edt t\u1ef1 ren, \u0111\u1eb7c bi\u1ec7t l\u00e0 lo\u1ea1i m\u1ea1 \u0111i\u1ec7n, d\u1ec5 b\u1ecb gi\u00f2n do hydro. Quy tr\u00ecnh s\u1ea3n xu\u1ea5t ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m tra theo ti\u00eau chu\u1ea9n GB\/T 3098.17 (ph\u01b0\u01a1ng ph\u00e1p b\u1ec1 m\u1eb7t ch\u1ecbu l\u1ef1c song song) \u0111\u1ec3 ki\u1ec3m so\u00e1t c\u00e1c r\u1ee7i ro li\u00ean quan \u0111\u1ebfn hydro. N\u1ebfu ph\u00e1t hi\u1ec7n hi\u1ec7n t\u01b0\u1ee3ng gi\u00f2n, quy tr\u00ecnh ph\u1ea3i \u0111\u01b0\u1ee3c c\u1ea3i ti\u1ebfn. \u1ed0c v\u00edt m\u1ea1 \u0111i\u1ec7n ph\u1ea3i \u0111\u01b0\u1ee3c x\u1eed l\u00fd lo\u1ea1i b\u1ecf hydro theo ti\u00eau chu\u1ea9n GB\/T 5267.<\/p>\n

L\u01b0u \u00fd: N\u00ean s\u1eed d\u1ee5ng l\u1edbp ph\u1ee7 k\u1ebdm d\u1ea1ng v\u1ea3y kh\u00f4ng \u0111i\u1ec7n ph\u00e2n theo ti\u00eau chu\u1ea9n ISO 10683.<\/p>\n

4.9 \u0110\u1ed9 c\u1ee9ng l\u00f5i sau khi t\u00f4i l\u1ea1i<\/h3>\n

Khi th\u1eed nghi\u1ec7m theo m\u1ee5c 5.8, \u0111\u1ed9 gi\u1ea3m \u0111\u1ed9 c\u1ee9ng l\u00f5i sau khi t\u00f4i l\u1ea1i kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 20 HV.<\/p>\n

4.10 \u0110\u1ed9 b\u1ec1n k\u00e9o<\/h3>\n

\u0110\u1ed1i v\u1edbi v\u00edt c\u00f3 chi\u1ec1u d\u00e0i \u226512 mm ho\u1eb7c \u22653d, vi\u1ec7c th\u1eed nghi\u1ec7m \u0111\u1ed9 b\u1ec1n k\u00e9o c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c nh\u00e0 cung c\u1ea5p v\u00e0 ng\u01b0\u1eddi mua th\u1ecfa thu\u1eadn. L\u01b0u \u00fd: B\u1ea3ng 3 ch\u1ec9 \u0111\u01b0a ra c\u00e1c gi\u00e1 tr\u1ecb t\u1ea3i tr\u1ecdng k\u00e9o \u0111\u1ec3 tham kh\u1ea3o.<\/p>\n

Ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m<\/h2>\n

5.1 Ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng l\u00f5i<\/h3>\n

\u0110\u1ed9 c\u1ee9ng l\u00f5i ph\u1ea3i \u0111\u01b0\u1ee3c \u0111o t\u1ea1i \u0111i\u1ec3m gi\u1eefa b\u00e1n k\u00ednh tr\u00ean m\u1eb7t c\u1eaft ngang c\u00e1ch xa \u0111\u1ea7u v\u00e0 \u0111i qua \u0111\u01b0\u1eddng k\u00ednh nh\u1ecf, theo ti\u00eau chu\u1ea9n GB\/T 4340.1.<\/p>\n

5.2 Th\u1eed nghi\u1ec7m \u0111\u1ed9 c\u1ee9ng b\u1ec1 m\u1eb7t<\/h3>\n

Vi\u1ec7c ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u1edf \u0111\u1ea7u, th\u00e2n ho\u1eb7c \u0111\u1ea7u (n\u1ebfu h\u00ecnh d\u1ea1ng cho ph\u00e9p). Ki\u1ec3m tra theo ti\u00eau chu\u1ea9n GB\/T 4340.1 sau khi lo\u1ea1i b\u1ecf l\u1edbp ph\u1ee7. \u0110\u1ec3 ph\u00e2n x\u1eed, s\u1eed d\u1ee5ng \u0111\u1ed9 c\u1ee9ng vi m\u00f4 Vickers (HV0.1) tr\u00ean c\u00e1c m\u1eb7t c\u1eaft c\u00f3 k\u00edch th\u01b0\u1edbc \u22650,05 mm t\u00ednh t\u1eeb m\u00e9p \u0111\u1ed1i v\u1edbi \u0111\u01b0\u1eddng k\u00ednh \u22654 mm; th\u01b0\u01a1ng l\u01b0\u1ee3ng \u0111\u1ed1i v\u1edbi \u0111\u01b0\u1eddng k\u00ednh <4 mm.<\/p>\n

5.3 Ki\u1ec3m tra \u0111\u1ed9 s\u00e2u tr\u01b0\u1eddng h\u1ee3p<\/h3>\n

\u0110\u1ed9 s\u00e2u l\u1edbp v\u1ecf l\u00e0 kho\u1ea3ng c\u00e1ch vu\u00f4ng g\u00f3c t\u1eeb b\u1ec1 m\u1eb7t \u0111\u1ebfn \u0111i\u1ec3m c\u00f3 \u0111\u1ed9 c\u1ee9ng b\u1eb1ng \u0111\u1ed9 c\u1ee9ng l\u00f5i +30 HV0.3. \u0110\u1ec3 ph\u00e2n x\u1eed, s\u1eed d\u1ee5ng \u0111\u1ed9 c\u1ee9ng vi m\u00f4 (HV0.3).<\/p>\n

5.4 Th\u1eed nghi\u1ec7m \u0111\u1ed9 b\u1ec1n xo\u1eafn<\/h3>\n

V\u1eb7n v\u00edt sao cho \u00edt nh\u1ea5t hai ren n\u1eb1m tr\u1ecdn trong b\u1ed9 ph\u1eadn c\u1ed1 \u0111\u1ecbnh v\u00e0 hai ren c\u00f2n l\u1ea1i kh\u00f4ng b\u1ecb tu\u1ed9t ra. Si\u1ebft ch\u1eb7t v\u00edt cho \u0111\u1ebfn khi b\u1ecb h\u1ecfng; gi\u00e1 tr\u1ecb ph\u1ea3i \u0111\u00e1p \u1ee9ng B\u1ea3ng 3.<\/p>\n

5.5 Ki\u1ec3m tra \u0111\u1ed9 ch\u1eafc ch\u1eafn c\u1ee7a \u0111\u1ea7u<\/h3>\n

L\u1eafp v\u00edt v\u00e0o n\u00eam c\u00f3 \u0111\u01b0\u1eddng k\u00ednh l\u1ed7 = \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a +0,05 mm (\u2264M6) ho\u1eb7c +0,1 mm (>M6~M12). \u00c1p d\u1ee5ng t\u1ea3i tr\u1ecdng d\u1ecdc tr\u1ee5c cho \u0111\u1ebfn khi bi\u1ebfn d\u1ea1ng \u0111\u1ea1t 7\u00b0. Kh\u00f4ng d\u00f9ng cho v\u00edt ch\u00ecm.<\/p>\n

5.6 Th\u1eed nghi\u1ec7m kh\u1ea3 n\u0103ng l\u00e1i<\/h3>\n

V\u1eb7n v\u00edt v\u00e0o t\u1ea5m th\u1eed (th\u00e9p cacbon th\u1ea5p, 140~180 HV30, \u0111\u1ed9 d\u00e0y = \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a, l\u1ed7 theo B\u1ea3ng 5) cho \u0111\u1ebfn khi m\u1ed9t ren nh\u00f4 ra. L\u1ef1c d\u1ecdc tr\u1ee5c ban \u0111\u1ea7u: \u226450 N (\u2264M5), \u2264100 N (>M5). T\u1ed1c \u0111\u1ed9 \u226430 v\u00f2ng\/ph\u00fat \u0111\u1ec3 ph\u00e2n x\u1eed. M\u00f4-men xo\u1eafn t\u1ed1i \u0111a l\u00e0 m\u00f4-men xo\u1eafn khi v\u1eb7n; \u0111\u01b0\u1ee3c ph\u00e9p s\u1eed d\u1ee5ng ch\u1ea5t b\u00f4i tr\u01a1n.<\/p>\n\n\n\n\n\n\n\n
B\u1ea3ng 5: \u0110\u1ed9 d\u00e0y t\u1ea5m th\u1eed nghi\u1ec7m v\u00e0 \u0111\u01b0\u1eddng k\u00ednh l\u1ed7<\/caption>\n
\u0110\u01b0\u1eddng k\u00ednh ren danh ngh\u0129a (mm)<\/th>\n2<\/th>\n2.5<\/th>\n3<\/th>\n3.5<\/th>\n4<\/th>\n5<\/th>\n6<\/th>\n8<\/th>\n10<\/th>\n12<\/th>\n<\/tr>\n<\/thead>\n
\u0110\u1ed9 d\u00e0y (mm)<\/td>\n2<\/td>\n2.5<\/td>\n3<\/td>\n3.5<\/td>\n4<\/td>\n5<\/td>\n6<\/td>\n8<\/td>\n10<\/td>\n12<\/td>\n<\/tr>\n
\u0110\u01b0\u1eddng k\u00ednh l\u1ed7 (mm)<\/td>\nT\u1ed1i \u0111a<\/td>\n1.825<\/td>\n2.275<\/td>\n2.775<\/td>\n3.18<\/td>\n3.68<\/td>\n4.53<\/td>\n5.43<\/td>\n7.336<\/td>\n9.236<\/td>\n11.143<\/td>\n<\/tr>\n
T\u1ed1i thi\u1ec3u<\/td>\n1.8<\/td>\n2.25<\/td>\n2.75<\/td>\n3.15<\/td>\n3.65<\/td>\n4.5<\/td>\n5.4<\/td>\n7.3<\/td>\n9.2<\/td>\n11.1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

L\u01b0u \u00fd: Dung sai \u0111\u1ed9 d\u00e0y t\u1ea5m th\u1eed theo ti\u00eau chu\u1ea9n GB\/T 709.<\/p>\n

5.7 Th\u1eed nghi\u1ec7m gi\u00f2n hydro<\/h3>\n

Theo GB\/T 3098.17.<\/p>\n

5.8 Th\u1eed nghi\u1ec7m t\u00f4i l\u1ea1i<\/h3>\n

Ch\u00eanh l\u1ec7ch \u0111\u1ed9 c\u1ee9ng l\u00f5i trung b\u00ecnh (ba \u0111i\u1ec3m) tr\u01b0\u1edbc\/sau khi t\u00f4i l\u1ea1i (330\u00b0C, 1 gi\u1edd) \u226420 HV. Ch\u1ec9 d\u00f9ng \u0111\u1ec3 ph\u00e2n x\u1eed tranh ch\u1ea5p.<\/p>\n

5.9 Th\u1eed nghi\u1ec7m k\u00e9o<\/h3>\n

D\u00f9ng v\u00edt k\u1eb9p c\u00f3 \u22656 ren l\u1ed9 ra ngo\u00e0i. \u00c1p d\u1ee5ng t\u1ea3i tr\u1ecdng d\u1ecdc tr\u1ee5c \u226425 mm\/ph\u00fat cho \u0111\u1ebfn khi g\u00e3y, v\u1ebft g\u00e3y ph\u1ea3i \u1edf th\u00e2n ho\u1eb7c ren, kh\u00f4ng ph\u1ea3i \u1edf ch\u1ed7 n\u1ed1i \u0111\u1ea7u v\u00edt.<\/p>\n

C\u1edd l\u00ea l\u1ef1c<\/h2>\n

C\u1edd l\u00ea l\u1ef1c d\u00f9ng cho c\u00e1c th\u1eed nghi\u1ec7m xo\u1eafn v\u00e0 kh\u1ea3 n\u0103ng v\u1eadn h\u00e0nh ph\u1ea3i c\u00f3 sai s\u1ed1 \u0111o trong ph\u1ea1m vi \u00b13% so v\u1edbi gi\u00e1 tr\u1ecb quy \u0111\u1ecbnh. C\u1edd l\u00ea c\u1ea7m tay d\u00f9ng cho vi\u1ec7c ph\u00e2n x\u1eed.<\/p>\n

\u0110\u00e1nh d\u1ea5u<\/h2>\n

7.1 K\u00fd hi\u1ec7u \u0111\u00e1nh d\u1ea5u<\/h3>\n

\u1ed0c v\u00edt t\u1ef1 ren \u0111\u01b0\u1ee3c t\u00f4i c\u1ee9ng v\u00e0 ram nhi\u1ec7t, c\u00f3 kh\u1eafc k\u00fd hi\u1ec7u \u201c-O-\u201d.<\/p>\n

7.2 Nh\u1eadn d\u1ea1ng<\/h3>\n

\u1ed0c v\u00edt t\u00f4i c\u1ee9ng b\u1ec1 m\u1eb7t ph\u1ea3i c\u00f3 d\u1ea5u hi\u1ec7u ch\u00ecm ho\u1eb7c n\u1ed5i theo m\u1ee5c 7.1. B\u1eaft bu\u1ed9c \u0111\u1ed1i v\u1edbi \u0111\u1ea7u l\u1ee5c gi\u00e1c ho\u1eb7c l\u1ee5c gi\u00e1c th\u00f9y \u22655 mm, t\u1ed1t nh\u1ea5t l\u00e0 tr\u00ean \u0111\u1ea7u v\u00edt. C\u00e1c lo\u1ea1i kh\u00e1c theo th\u1ecfa thu\u1eadn.<\/p>\n

7.3 D\u1ea5u hi\u1ec7u c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t<\/h3>\n

Nh\u00e3n hi\u1ec7u ho\u1eb7c th\u00f4ng tin nh\u1eadn d\u1ea1ng c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t l\u00e0 b\u1eaft bu\u1ed9c tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c s\u1ea3n ph\u1ea9m c\u00f3 nh\u00e3n m\u00e1c.<\/p>\n

C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n
\n
Theo ti\u00eau chu\u1ea9n n\u00e0y, nhi\u1ec7t \u0111\u1ed9 t\u00f4i t\u1ed1i thi\u1ec3u cho v\u00edt t\u1ef1 ren l\u00e0 bao nhi\u00eau?<\/dt>\n
Nhi\u1ec7t \u0111\u1ed9 t\u00f4i luy\u1ec7n t\u1ed1i thi\u1ec3u l\u00e0 340\u00b0C \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u v\u1ec1 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc nh\u01b0 \u0111\u1ed9 c\u1ee9ng v\u00e0 \u0111\u1ed9 b\u1ec1n.<\/dd>\n
Hi\u1ec7n t\u01b0\u1ee3ng gi\u00f2n hydro trong \u1ed1c v\u00edt m\u1ea1 \u0111i\u1ec7n \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u01b0 th\u1ebf n\u00e0o?<\/dt>\n
C\u00e1c quy tr\u00ecnh \u0111\u01b0\u1ee3c ki\u1ec3m tra theo ti\u00eau chu\u1ea9n GB\/T 3098.17 v\u00e0 vi\u1ec7c lo\u1ea1i b\u1ecf hydro l\u00e0 b\u1eaft bu\u1ed9c theo ti\u00eau chu\u1ea9n GB\/T 5267. C\u00e1c l\u1edbp ph\u1ee7 kh\u00f4ng \u0111i\u1ec7n ph\u00e2n nh\u01b0 k\u1ebdm d\u1ea1ng v\u1ea3y theo ti\u00eau chu\u1ea9n ISO 10683 \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb \u0111\u1ec3 gi\u1ea3m thi\u1ec3u r\u1ee7i ro.<\/dd>\n
C\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 c\u1ee9ng l\u00f5i v\u00e0 b\u1ec1 m\u1eb7t l\u00e0 g\u00ec?<\/dt>\n
\u0110\u1ed9 c\u1ee9ng l\u00f5i ph\u1ea3i \u0111\u1ea1t 290~370 HV10, v\u00e0 \u0111\u1ed9 c\u1ee9ng b\u1ec1 m\u1eb7t \u00edt nh\u1ea5t 450 HV0.3, \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 b\u1ec1n v\u00e0 kh\u1ea3 n\u0103ng t\u1ea1o ren.<\/dd>\n
V\u1edbi nh\u1eefng k\u00edch th\u01b0\u1edbc v\u00edt n\u00e0o th\u00ec vi\u1ec7c ki\u1ec3m tra \u0111\u1ed9 b\u1ec1n k\u00e9o l\u00e0 kh\u00f4ng b\u1eaft bu\u1ed9c?<\/dt>\n
Th\u1eed nghi\u1ec7m k\u00e9o l\u00e0 t\u00f9y ch\u1ecdn theo th\u1ecfa thu\u1eadn \u0111\u1ed1i v\u1edbi c\u00e1c v\u00edt c\u00f3 chi\u1ec1u d\u00e0i \u226512 mm ho\u1eb7c \u22653 l\u1ea7n \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a, v\u1edbi t\u1ea3i tr\u1ecdng tham kh\u1ea3o trong B\u1ea3ng 3.<\/dd>\n
C\u1ea7n \u0111\u00e1nh d\u1ea5u nh\u1eefng g\u00ec \u0111\u1ed1i v\u1edbi \u1ed1c v\u00edt t\u1ef1 ren t\u00f4i c\u1ee9ng b\u1ec1 m\u1eb7t?<\/dt>\n
K\u00fd hi\u1ec7u \u201c-O-\u201d ph\u1ea3i \u0111\u01b0\u1ee3c d\u00e1n k\u00e8m v\u1edbi nh\u00e3n hi\u1ec7u c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t, \u0111\u1eb7c bi\u1ec7t l\u00e0 tr\u00ean c\u00e1c \u0111\u1ea7u c\u00f3 \u0111\u01b0\u1eddng k\u00ednh \u22655 mm \u0111\u1ed1i v\u1edbi lo\u1ea1i l\u1ee5c gi\u00e1c.<\/dd>\n
\u0110\u1ed9 s\u00e2u c\u1ee7a l\u1edbp v\u1ecf b\u1ecdc \u0111\u01b0\u1ee3c \u0111o nh\u01b0 th\u1ebf n\u00e0o v\u00e0 gi\u1edbi h\u1ea1n c\u1ee7a v\u00edt 4 mm l\u00e0 bao nhi\u00eau?<\/dt>\n
\u0110\u01b0\u1ee3c \u0111o theo ti\u00eau chu\u1ea9n 5.3 s\u1eed d\u1ee5ng HV0.3; \u0111\u1ed1i v\u1edbi \u0111\u1ed9 d\u00e0y 4 mm, t\u1ed1i thi\u1ec3u 0.1 mm v\u00e0 t\u1ed1i \u0111a 0.25 mm \u0111\u1ec3 c\u00e2n b\u1eb1ng \u0111\u1ed9 c\u1ee9ng v\u00e0 \u0111\u1ed9 d\u1ebbo dai.<\/dd>\n<\/dl>\n<\/div>","protected":false},"excerpt":{"rendered":"

GB\/T3098.7-2000 specifies the mechanical properties of self-tapping screws made from carburized steel. This standard ensures that these fasteners meet rigorous performance criteria for applications requiring reliable threading and strength. Below, we detail the key aspects of materials, mechanical properties, test methods, and related requirements. Materials Self-tapping screws shall be manufactured from carburized steel via cold […]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[220],"tags":[],"class_list":["post-5564","post","type-post","status-publish","format-standard","hentry","category-technical-documentation-and-references"],"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts\/5564","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/comments?post=5564"}],"version-history":[{"count":2,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts\/5564\/revisions"}],"predecessor-version":[{"id":5566,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts\/5564\/revisions\/5566"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/media?parent=5564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/categories?post=5564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/tags?post=5564"}],"curies":[{"name":"trang web","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}