Carbon structural steel (Q235B / C / D) 1 The main purpose of the thickness range of 6 ~ 100mm Q235B / Q235C / Q235D carbon structural steel has excellent ductility, toughness, steel products used for construction machinery, transportation machinery, construction machinery agricultural machinery, household appliances and light manufacturing and other general structure, does not recommend the use of a wider production of cold-formed structural members and direct effect of the use of the elbow, to prohibit such an alternative container steel, bridges, high-rise buildings such as the use of special purpose steel . 2 grade and standard grade Q235B / C / D; the implementation of standards: GB / T 700-2006 "carbon steel" (equivalent to the Japanese standard JISG3106-2008 in grades SS400, European standard EN10025-04 in grade S235JR / J0 / J2 ) 3 Technical delivery conditions for 3.1 Specifications 6 ~ 100 × 1800 ~ 4050 × Lmm. 3.2 Chemical Composition Table 1 melting ingredients,% Grade Grade C Si Mn PS Q235 B ≤0.20 ≤0.35 ≤1.40 ≤0.045 ≤0.045 C ≤0.17 ≤0.040 ≤0.040 D ≤0.17 ≤0.035 ≤0.035 Note: Available B, C Class Z the performance of steel, such as requiring Z by GB / T5313-85 standard regulations to performance, steel S content, Z to the performance of the steel plate in the Z-direction after identifies the corresponding level. 3.3 Table 2 mechanical properties of the mechanical properties of grade yield strength ReH, MPa, no less than the tensile strength Rm, MPa Elongation A,% is not less than the impact energy, vertical, J cold bend test 180 ° ≥6-16> 16-40 > 40-60> 60-100 ≤40> 40-60> 60-100 ℃ ≥ ≥6-60> 60-100 Q235B 235 225 215 215 370-500 26 25 24 20 27 d = 1.5ad = 2.5a Q235C 0 Q235D -20 Note: The thickness of less than 25mm of Q235B by the need to agree, not to test the impact energy. Delivery status: hot-rolled, controlled rolling or normalizing physical quality steel grades 4 grade MPa tensile yield strength MPa Elongation A% impact energy KV2, 180 ° vertical cold bend test temperature ℃ J Q235 B 260 ~ 350 390 ~ 500 26 to 312 050 to 150 C 0 D -20 5 good application performance I produced a series of thick steel Q235 steel is widely used in construction, engineering machinery, heavy vehicles, bridges, pressure vessels, etc., used in the Beijing Olympic Games projects, national key project in Dalian City, "even into the Yellow River" project, Maanshan technological transformation projects, Lake Bridge. Its excellent physical quality of the majority of users praise.