{"id":7911,"date":"2026-06-08T02:26:44","date_gmt":"2026-06-08T02:26:44","guid":{"rendered":"https:\/\/www.shandongruiying.com\/?p=7911"},"modified":"2026-06-08T02:31:44","modified_gmt":"2026-06-08T02:31:44","slug":"introduction-to-common-wall-thickness-series-of-international-steel-pipes","status":"publish","type":"post","link":"https:\/\/www.shandongruiying.com\/vi\/introduction-to-common-wall-thickness-series-of-international-steel-pipes\/","title":{"rendered":"Gi\u1edbi thi\u1ec7u v\u1ec1 c\u00e1c d\u00f2ng s\u1ea3n ph\u1ea9m \u1ed1ng th\u00e9p qu\u1ed1c t\u1ebf c\u00f3 \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng ti\u00eau chu\u1ea9n"},"content":{"rendered":"

\u0110\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng th\u00e9p l\u00e0 m\u1ed9t th\u00f4ng s\u1ed1 quan tr\u1ecdng quy\u1ebft \u0111\u1ecbnh kh\u1ea3 n\u0103ng ch\u1ecbu \u00e1p l\u1ef1c, \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc v\u00e0 c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u1ee9ng d\u1ee5ng. Tr\u00ean ph\u1ea1m vi to\u00e0n c\u1ea7u, c\u00e1c d\u00e3y \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng \u0111\u01b0\u1ee3c ti\u00eau chu\u1ea9n h\u00f3a \u0111\u1ea3m b\u1ea3o t\u00ednh t\u01b0\u01a1ng th\u00edch v\u00e0 nh\u1ea5t qu\u00e1n gi\u1eefa c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t. B\u00e0i vi\u1ebft n\u00e0y gi\u1edbi thi\u1ec7u c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng qu\u1ed1c t\u1ebf \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t, t\u1eadp trung v\u00e0o \u0111\u1ecbnh ngh\u0129a, ph\u00e2n lo\u1ea1i, \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh c\u1ee7a ch\u00fang.<\/p>\n\n\n\n

1. H\u1ec7 th\u1ed1ng l\u1ecbch tr\u00ecnh (Sch): Ti\u00eau chu\u1ea9n to\u00e0n c\u1ea7u (ASME\/ANSI)<\/strong><\/strong><\/h3>\n\n\n\n

H\u1ec7 th\u1ed1ng Schedule (Sch), \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh trong ti\u00eau chu\u1ea9n ASME B36.10M (th\u00e9p cacbon\/th\u00e9p h\u1ee3p kim) v\u00e0 ASME B36.19M (th\u00e9p kh\u00f4ng g\u1ec9), l\u00e0 ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf ch\u1ee7 \u0111\u1ea1o v\u1ec1 \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng. H\u1ec7 th\u1ed1ng n\u00e0y s\u1eed d\u1ee5ng c\u00e1c \u201cs\u1ed1 schedule\u201d kh\u00f4ng c\u00f3 \u0111\u01a1n v\u1ecb \u0111\u1ec3 bi\u1ec3u th\u1ecb \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng \u2014 s\u1ed1 c\u00e0ng cao th\u00ec th\u00e0nh \u1ed1ng c\u00e0ng d\u00e0y v\u00e0 m\u1ee9c \u00e1p su\u1ea5t \u0111\u1ecbnh m\u1ee9c c\u00e0ng cao.<\/p>\n\n\n\n

1.1 \u0110\u1ecbnh ngh\u0129a c\u1ed1t l\u00f5i<\/strong><\/strong><\/h4>\n\n\n\n

S\u1ed1 l\u1ecbch tr\u00ecnh \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n d\u1ef1a tr\u00ean c\u00f4ng th\u1ee9c g\u1ea7n \u0111\u00fang sau: Sch. \u2248 1000 \u00d7 P \/ S (P = \u00e1p su\u1ea5t l\u00e0m vi\u1ec7c; S = \u1ee9ng su\u1ea5t cho ph\u00e9p). Tr\u00ean th\u1ef1c t\u1ebf, gi\u00e1 tr\u1ecb n\u00e0y \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a d\u1ef1a tr\u00ean d\u1eef li\u1ec7u th\u1ef1c nghi\u1ec7m, ch\u1ee9 kh\u00f4ng ph\u1ea3i qua c\u00e1c t\u00ednh to\u00e1n nghi\u00eam ng\u1eb7t.<\/p>\n\n\n\n

1.2 C\u00e1c lo\u1ea1t bi\u1ec3u m\u1eabu chung v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng<\/strong><\/strong><\/h4>\n\n\n\n
L\u1ecbch tr\u00ecnh<\/strong><\/strong><\/td>B\u00ed danh<\/strong><\/strong><\/td>T\u00ednh n\u0103ng<\/strong><\/strong><\/td>C\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/strong><\/strong><\/td><\/tr>
L\u1edbp 5S\/5<\/td>Th\u00e0nh m\u1ecfng<\/td>Si\u00eau m\u1ecfng, si\u00eau nh\u1eb9<\/td>H\u1ec7 th\u1ed1ng \u00e1p su\u1ea5t th\u1ea5p, kh\u00f4ng quan tr\u1ecdng (th\u00f4ng gi\u00f3, ch\u1ea5t l\u1ecfng c\u00f3 l\u01b0u l\u01b0\u1ee3ng th\u1ea5p)<\/td><\/tr>
Sch 10S\/10<\/td>T\u01b0\u1eddng m\u1ecfng<\/td>M\u1ecfng, ti\u1ebft ki\u1ec7m chi ph\u00ed<\/td>H\u1ec7 th\u1ed1ng \u1ed1ng d\u1eabn \u00e1p su\u1ea5t th\u1ea5p, h\u1ec7 th\u1ed1ng HVAC, \u0111\u01b0\u1eddng \u1ed1ng th\u00e9p kh\u00f4ng g\u1ec9<\/td><\/tr>
Sch 20<\/td>Trung b\u00ecnh-nh\u1eb9<\/td>\u0110\u1ed9 d\u00e0y v\u1eeba ph\u1ea3i<\/td>\u0110\u01b0\u1eddng \u1ed1ng \u00e1p su\u1ea5t th\u1ea5p \u0111a d\u1ee5ng<\/td><\/tr>
Sch 40<\/td>STD (Ti\u00eau chu\u1ea9n)<\/td>Ti\u00eau chu\u1ea9n ph\u1ed5 bi\u1ebfn nh\u1ea5t<\/td>V\u1eadn chuy\u1ec3n ch\u1ea5t l\u1ecfng \u1edf \u00e1p su\u1ea5t trung b\u00ecnh (n\u01b0\u1edbc, kh\u00ed, d\u1ea7u), \u1ee9ng d\u1ee5ng trong k\u1ebft c\u1ea5u<\/td><\/tr>
Sch 60<\/td>–<\/td>\u0110\u1eb7c l\u1ea1i<\/td>H\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng \u1ed1ng c\u00f4ng nghi\u1ec7p \u00e1p su\u1ea5t trung b\u00ecnh \u0111\u1ebfn cao<\/td><\/tr>
Sch 80<\/td>XS (Si\u00eau b\u1ec1n)<\/td>D\u00e0y, c\u00f3 \u0111\u1ed9 b\u1ec1n cao<\/td>H\u1ec7 th\u1ed1ng \u00e1p su\u1ea5t cao (h\u01a1i n\u01b0\u1edbc, \u0111\u01b0\u1eddng \u1ed1ng th\u1ee7y l\u1ef1c), m\u00f4i tr\u01b0\u1eddng \u0103n m\u00f2n<\/td><\/tr>
Sch 160<\/td>–<\/td>Si\u00eau d\u00e0y<\/td>C\u00e1c \u1ee9ng d\u1ee5ng \u00e1p su\u1ea5t c\u1ef1c cao (v\u1eadn chuy\u1ec3n d\u1ea7u\/kh\u00ed \u0111\u1ed1t, nh\u00e0 m\u00e1y \u0111i\u1ec7n)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

1.3 Nh\u1eefng \u0111i\u1ec3m ch\u00ednh<\/strong><\/strong><\/h4>\n\n\n\n
    \n
  • H\u1eadu t\u1ed1 S (Sch 5S\/10S\/40S\/80S)<\/strong>: D\u00e0nh ri\u00eang cho c\u00e1c lo\u1ea1i \u1ed1ng th\u00e9p kh\u00f4ng g\u1ec9 (ASME B36.19M), c\u00f3 \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng m\u1ecfng h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i \u1ed1ng th\u00e9p cacbon t\u01b0\u01a1ng \u0111\u01b0\u01a1ng.<\/li>\n\n\n\n
  • \u0110\u01b0\u1eddng k\u00ednh ngo\u00e0i c\u1ed1 \u0111\u1ecbnh (OD)<\/strong>: \u0110\u1ed1i v\u1edbi m\u1ed9t K\u00edch th\u01b0\u1edbc \u1ed0ng Danh ngh\u0129a (NPS) nh\u1ea5t \u0111\u1ecbnh, \u0110\u01b0\u1eddng k\u00ednh ngo\u00e0i (OD) l\u00e0 h\u1eb1ng s\u1ed1 \u2014 ch\u1ec9 c\u00f3 \u0110\u01b0\u1eddng k\u00ednh trong (ID) l\u00e0 gi\u1ea3m khi \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng t\u0103ng l\u00ean.<\/li>\n<\/ul>\n\n\n\n

    2. STD\/XS\/XXS: H\u1ec7 th\u1ed1ng ph\u00e2n lo\u1ea1i theo tr\u1ecdng l\u01b0\u1ee3ng truy\u1ec1n th\u1ed1ng<\/strong><\/strong><\/h3>\n\n\n\n

    Tr\u01b0\u1edbc khi h\u1ec7 th\u1ed1ng Sch ra \u0111\u1eddi, Hoa K\u1ef3 \u0111\u00e3 s\u1eed d\u1ee5ng c\u00e1c nh\u00e3n ghi tr\u1ecdng l\u01b0\u1ee3ng (v\u1eabn \u0111\u01b0\u1ee3c tham chi\u1ebfu r\u1ed9ng r\u00e3i cho \u0111\u1ebfn ng\u00e0y nay):<\/p>\n\n\n\n

      \n
    • STD (Tr\u1ecdng l\u01b0\u1ee3ng ti\u00eau chu\u1ea9n)<\/strong>: T\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi Sch 40 khi NPS \u226410; \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh c\u1ed1 \u0111\u1ecbnh l\u00e0 9,53 mm khi NPS \u226512.<\/li>\n\n\n\n
    • XS (Si\u00eau b\u1ec1n)<\/strong>: T\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi Sch 80 \u0111\u1ed1i v\u1edbi NPS \u22648; c\u1ed1 \u0111\u1ecbnh \u1edf m\u1ee9c 12,70 mm \u0111\u1ed1i v\u1edbi NPS \u226512.<\/li>\n\n\n\n
    • XXS (Si\u00eau m\u1ea1nh g\u1ea5p \u0111\u00f4i)<\/strong>: D\u00e0y h\u01a1n nhi\u1ec1u so v\u1edbi XS; kh\u00f4ng c\u00f3 lo\u1ea1i t\u01b0\u01a1ng \u0111\u01b0\u01a1ng tr\u1ef1c ti\u1ebfp trong d\u00f2ng Sch \u2014 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong \u0111i\u1ec1u ki\u1ec7n \u00e1p su\u1ea5t c\u1ef1c cao.<\/li>\n<\/ul>\n\n\n\n

      3. C\u00e1c h\u1ec7 th\u1ed1ng \u0111o \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng qu\u1ed1c t\u1ebf kh\u00e1c<\/strong><\/strong><\/h3>\n\n\n\n

      3,1 GB (Ti\u00eau chu\u1ea9n Qu\u1ed1c gia Trung Qu\u1ed1c)<\/strong><\/strong><\/h4>\n\n\n\n
        \n
      • Ghi d\u1ea5u tr\u1ef1c ti\u1ebfp b\u1eb1ng \u0111\u01a1n v\u1ecb milim\u00e9t<\/strong>: \u0110\u1ed9 d\u00e0y th\u00e0nh \u0111\u01b0\u1ee3c ghi r\u00f5 b\u1eb1ng mm (v\u00ed d\u1ee5: 3,2 mm, 6,0 mm).<\/li>\n\n\n\n
      • C\u00e1c ti\u00eau chu\u1ea9n c\u1ed1t l\u00f5i<\/strong>: GB\/T 8163 (v\u1eadn chuy\u1ec3n ch\u1ea5t l\u1ecfng), GB\/T 17395 (k\u00edch th\u01b0\u1edbc).<\/li>\n\n\n\n
      • Kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch<\/strong>: Tu\u00e2n th\u1ee7 lo\u1ea1t ti\u00eau chu\u1ea9n ASME Sch \u0111\u1ec3 thu\u1eadn ti\u1ec7n cho vi\u1ec7c tra c\u1ee9u ch\u00e9o.<\/li>\n<\/ul>\n\n\n\n

        3.2 DIN (Ti\u00eau chu\u1ea9n C\u00f4ng nghi\u1ec7p \u0110\u1ee9c)<\/strong><\/strong><\/h4>\n\n\n\n
          \n
        • S\u1eed d\u1ee5ng DN (\u0110\u01b0\u1eddng k\u00ednh danh ngh\u0129a) + \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng tr\u1ef1c ti\u1ebfp (mm).<\/li>\n\n\n\n
        • C\u00e1c d\u00f2ng s\u1ea3n ph\u1ea9m ph\u1ed5 bi\u1ebfn: DIN 2448 (kh\u00f4ng m\u1ed1i h\u00e0n), DIN 2458 (h\u00e0n) \u2014 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i \u1edf ch\u00e2u \u00c2u.<\/li>\n<\/ul>\n\n\n\n

          3.3 JIS (Ti\u00eau chu\u1ea9n C\u00f4ng nghi\u1ec7p Nh\u1eadt B\u1ea3n)<\/strong><\/strong><\/h4>\n\n\n\n
            \n
          • \u00c1p d\u1ee5ng ti\u00eau chu\u1ea9n Sch (t\u01b0\u01a1ng t\u1ef1 ASME) c\u00f9ng v\u1edbi vi\u1ec7c \u0111\u00e1nh d\u1ea5u tr\u1ef1c ti\u1ebfp b\u1eb1ng mm.<\/li>\n\n\n\n
          • Ti\u00eau chu\u1ea9n ch\u00ednh: JIS G3454 (\u1ed1ng th\u00e9p cacbon d\u00f9ng trong h\u1ec7 th\u1ed1ng \u00e1p l\u1ef1c).<\/li>\n<\/ul>\n\n\n\n

            3.4 H\u1ec7 th\u1ed1ng ISO<\/strong><\/strong><\/h4>\n\n\n\n
              \n
            • H\u00e0i h\u00f2a c\u00e1c ti\u00eau chu\u1ea9n to\u00e0n c\u1ea7u, k\u1ebft h\u1ee3p s\u1ed1 Sch v\u00e0 \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng theo h\u1ec7 m\u00e9t.<\/li>\n\n\n\n
            • \u0110\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch xuy\u00ean bi\u00ean gi\u1edbi cho c\u00e1c d\u1ef1 \u00e1n qu\u1ed1c t\u1ebf.<\/li>\n<\/ul>\n\n\n\n

              4. So s\u00e1nh c\u00e1c d\u1ea3i \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng th\u00f4ng d\u1ee5ng (NPS 4\u2033\/DN100, \u0111\u01b0\u1eddng k\u00ednh ngo\u00e0i = 114,3 mm)<\/strong><\/strong><\/h3>\n\n\n\n
              Ti\u00eau chu\u1ea9n<\/strong><\/strong><\/td>Lo\u1ea1t phim<\/strong><\/strong><\/td>\u0110\u1ed9 d\u00e0y th\u00e0nh (mm)<\/strong><\/strong><\/td>\u00c1p su\u1ea5t \u0111\u1ecbnh m\u1ee9c (bar, x\u1ea5p x\u1ec9)<\/strong><\/strong><\/td><\/tr>
              ASME B36.10M<\/td>Sch 40 (ti\u00eau chu\u1ea9n)<\/td>6.02<\/td>100<\/td><\/tr>
              ASME B36.10M<\/td>Sch 80 (XS)<\/td>8.56<\/td>160<\/td><\/tr>
              GB\/T 8163<\/td>6,0 mm<\/td>6.0<\/td>98<\/td><\/tr>
              DIN 2448<\/td>6,3 mm<\/td>6.3<\/td>105<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

              5. C\u00e1c nguy\u00ean t\u1eafc l\u1ef1a ch\u1ecdn d\u00e3y \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng<\/strong><\/strong><\/h3>\n\n\n\n
                \n
              1. \u00c1p su\u1ea5t v\u00e0 nhi\u1ec7t \u0111\u1ed9<\/strong>: \u00c1p su\u1ea5t\/nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n \u0111\u00f2i h\u1ecfi th\u00e0nh \u1ed1ng ph\u1ea3i d\u00e0y h\u01a1n (v\u00ed d\u1ee5: Sch 80 \u0111\u1ed1i v\u1edbi h\u01a1i n\u01b0\u1edbc \u00e1p su\u1ea5t cao).<\/li>\n\n\n\n
              2. Ch\u1ea5t li\u1ec7u<\/strong>: Th\u00e9p kh\u00f4ng g\u1ec9 thu\u1ed9c d\u00f2ng Sch c\u00f3 h\u1eadu t\u1ed1 S (\u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng m\u1ecfng h\u01a1n so v\u1edbi th\u00e9p cacbon).<\/li>\n\n\n\n
              3. Chi ph\u00ed v\u00e0 hi\u1ec7u qu\u1ea3<\/strong>: Sch 40 (STD) mang l\u1ea1i s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa hi\u1ec7u su\u1ea5t v\u00e0 chi ph\u00ed cho h\u1ea7u h\u1ebft c\u00e1c \u1ee9ng d\u1ee5ng.<\/li>\n\n\n\n
              4. Tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n<\/strong>: Tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n k\u1ef9 thu\u1eadt c\u1ee7a d\u1ef1 \u00e1n (ASME cho Hoa K\u1ef3, GB cho Trung Qu\u1ed1c, DIN cho ch\u00e2u \u00c2u).<\/li>\n<\/ol>\n\n\n\n

                6. K\u1ebft lu\u1eadn<\/strong><\/strong><\/h3>\n\n\n\n

                H\u1ec7 th\u1ed1ng Schedule (Sch) (ASME B36.10M\/B36.19M) l\u00e0 ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf ph\u1ed5 bi\u1ebfn v\u1ec1 \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng th\u00e9p, v\u1edbi c\u00e1c ph\u1ee5 l\u1ee5c truy\u1ec1n th\u1ed1ng l\u00e0 STD\/XS\/XXS. C\u00e1c ti\u00eau chu\u1ea9n khu v\u1ef1c (GB, DIN, JIS) tu\u00e2n th\u1ee7 h\u1ec7 th\u1ed1ng Sch \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh t\u01b0\u01a1ng th\u00edch to\u00e0n c\u1ea7u. Vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng ph\u00f9 h\u1ee3p \u0111\u1ea3m b\u1ea3o an to\u00e0n, hi\u1ec7u qu\u1ea3 v\u00e0 ti\u1ebft ki\u1ec7m chi ph\u00ed trong c\u00e1c \u1ee9ng d\u1ee5ng v\u1eadn chuy\u1ec3n ch\u1ea5t l\u1ecfng, k\u1ebft c\u1ea5u v\u00e0 c\u00f4ng nghi\u1ec7p.<\/p>","protected":false},"excerpt":{"rendered":"

                \u0110\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng th\u00e9p l\u00e0 m\u1ed9t th\u00f4ng s\u1ed1 quan tr\u1ecdng quy\u1ebft \u0111\u1ecbnh kh\u1ea3 n\u0103ng ch\u1ecbu \u00e1p l\u1ef1c, \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc v\u00e0 c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u1ee9ng d\u1ee5ng. Tr\u00ean to\u00e0n c\u1ea7u, c\u00e1c d\u00e3y \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng \u0111\u01b0\u1ee3c ti\u00eau chu\u1ea9n h\u00f3a \u0111\u1ea3m b\u1ea3o t\u00ednh t\u01b0\u01a1ng th\u00edch v\u00e0 nh\u1ea5t qu\u00e1n gi\u1eefa c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t. B\u00e0i vi\u1ebft n\u00e0y gi\u1edbi thi\u1ec7u c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u1ed9 d\u00e0y th\u00e0nh \u1ed1ng qu\u1ed1c t\u1ebf \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t, t\u1eadp trung v\u00e0o \u0111\u1ecbnh ngh\u0129a, ph\u00e2n lo\u1ea1i, \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh c\u1ee7a ch\u00fang. 1. H\u1ec7 th\u1ed1ng Schedule (Sch): Ti\u00eau chu\u1ea9n to\u00e0n c\u1ea7u [\u2026]<\/p>","protected":false},"author":1,"featured_media":7912,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Common Wall Thickness Series of International Steel Pipes","_seopress_titles_desc":"Learn about mainstream international steel pipe wall thickness series including Schedule, STD, XS and metric standards. 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