MT 30-1992 metal top beam

MT 30-1976

MT 30-2000 metal top beam

GB 2656 MT 5 YB 3212 GB/T 157-2001 Geometrical product specifications(GPS) Series of conical tapers and taper angles GB/T 699-1999 Quality carbon structural steels GB/T 699-2015 Quality carbon structure steels GB/T 700-1988 Carbon structural steels GB/T 700-2006 Carbon structural steels GB 702-1986 Hot-rolled round and square steels—Dimension, shape, weight and tolerance GB/T 702-2004 Hot-rolled round and square steel bars-Dimension,Shape,weight and tolerance GB/T 702-2008 Hot-rolled steel bars—Dimensions,shape,weight and tolerances GB/T 702-2017 Hot-rolled steel bars—Dimensions,shape,weight and tolerances GB/T 704-1988 Dimensions, shape, weight and tolerances for hot-rolled flats GB/T 1184-1996 Geometrical tolerancing—Geometrical tolerance for features without individual tolerance indications GB/T 1804-2000 General tolerances for linear and angular dimensions without individual tolerance indications GB/T 2649-1989 Methods of sampling for mechanical properties tests of welded joint GB/T 2650-1989 Method of impact test for welded joint GB/T 2650-2008 Impact test methods on welded joints GB/T 2650-2022 Destructive tests on welds in metallic materials—Impact tests GB/T 2651-1989 Method of tensile test for welded joint GB/T 2651-2008 Tensile test method on welded joints GB/T 2651-2023 Destructive tests on welds in metallic materials—Transverse tensile test GB/T 2652-1989 Method of tensile tests for weld and deposited metal GB/T 2652-2008 Tensile test methods on weld and deposited metal GB/T 2652-2022 Destructive tests on welds in metallic materials—Longitudinal tensile test on weld metal in fusion welded joints GB/T 2653-1989 Methods of bend and compression tests for welded joint GB/T 2653-2008 Bend test methods on welded joints GB/T 2654-1989 Methods of hardness tests for welded joint and surfacing metal GB/T 2654-2008 Hardness test methods on welded joints GB/T 2655-1989 Method of strain-age sensibility test for welded joint GB/T 3077-1999 Alloy structure steels GB/T 3077-2015 Alloy structure steels GB/T 3414-1994 Hot-rolled profiled steels for coal mechanism GB/T 3414-2015 Hot-rolled profiled steels for coal mechanism GB/T 12361-2003 General specification of Steel die forgings GB/T 12361-2016 Steel die forgings—General specification GB/T 13306-1991 Plates GB/T 13306-2011 Plates MT 112-1993 Mining single-stage hydraulic post JB/T 4385.2-1999 Hammer-free forgings complexity classification and conversion coefficient MT/T 112.1-2006 Mining single-unit hydraulic pillar Part 1: General requirements JB/T 4385.1-1999 Hammer-freestone forgings general technical specification GB/T 157-2025 Geometrical product specifications(GPS)—Series of conical tapers and taper angles GB/Z 157-2026 In vitro diagnostic test systems—Requirements and recommendations for detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) by nucleic acid amplification methods