The quality grade symbols of Q235 steel plate are A, B, C and D respectively. Different grades represent different impact temperatures. ASTM A516 Grade 60 boiler steel plate, Q235A is not required for impact toughness test; Q235B is required for impact toughness test at room temperature (20 ℃); Q235C is required for impact toughness test at 0 ℃; Q235D is required for impact toughness test at - 20 ℃. For the above-mentioned B, C and D grade steels, Akv ≥27J is required under different temperature requirements. At different impact temperature, the impact value is also different.
Under the action of the roller and the plug, a cavity is formed in the blank, which is called the blank. Then send it to the automatic tube rolling machine to continue rolling. Finally, the wall thickness of the whole machine is equalized and the diameter is calibrated by the sizing machine to meet the specification requirements. It is an advanced method to produce ASTM A516 Grade 60 boiler steel plate, hot-rolled seamless steel tube by continuous rolling mill.
The company has strict control on the quality of ASTM A516 Grade 60 boiler steel plate. Each ASTM A516 Grade 60 boiler steel plate is inspected for the whole process, including raw material purchase, production process according to the procedures and relevant regulations. According to the technical standards and technical requirements, the composite quality inspection is carried out to confirm whether the ASTM A516 Grade 60 boiler steel plate meets the specified quality requirements.
In February 2019, the European Union stated that the sharp increase in Turkish ASTM A516 Grade 60 boiler steel plate and so on steel imports has seriously threatened steel production enterprises in member states. The EU has set import quotas for 26 steel products and imposed a 25% tariff on steel products imported in the future for a period of three years. The Turkish Trade Ministry said on Friday that Turkey had initiated a lawsuit against the EU on steel import tariffs with the World Trade Organization (WTO).