Q245R longitudinal seam steel pipe Q245R longitudinal welded pipe.
Q245R longitudinal seam steel pipe production method: double-sided submerged arc welded steel pipe, executive standard: GB T1502 Pressure vessels Part II;
Chemical Composition: Carbon Content C: 020. Silicon content Si: 035. Manganese content mn: 050-1.00, the phosphorus content of the steel plate p: 0025, steel plate sulfur content s: 0015, aluminum content alt: 0020
Mechanical properties: tensile strength b (mpa): 380-520mpa, yield strength 02 (MPa): 185-245MPa, elongation after fracture δ5 (%35, impact test temperature: -20, impact absorption energy kv J: 25J.
CB T3274-2007 "Carbon Cable Structural Steel and Low Alloy Structural Steel Hot Rolled Thick Steel Plate and Steel Strip" The steel plate use regulations are as follows:
a) The chemical composition (melting analysis) of the steel shall comply with the provisions of GB T7002006 "Carbon Cable Structural Steel", but the phosphorus and sulfur content in the steel plate quality certificate shall be in line with P 0035%、s≤0.035% of the requirements.
b) The steel plate with a thickness equal to or greater than 6mm shall be subject to impact test, and the test results shall comply with the provisions of GB T700. For the Q235C pot plate used for use with a temperature of less than 20 to 0 and a thickness equal to or greater than 6mm, the container manufacturing unit shall attach the O impact test for transverse testing, and the average impact energy of the three standard impact samples kv≥27j.The minimum value of impact energy for one specimen and the value of impact energy for small size impact specimens shall be specified in accordance with the corresponding provisions of GB T700.
e) The steel plate shall be cold-formed test, and the cold-formed qualification standard shall be in accordance with the provisions of GB T700.
d) The design pressure of the container is less than 16mpa.
e) The service temperature of the steel plate: 20 300 for the steel plate;Q235C steel plate is 0 300.
The thickness of the steel plate used for the container shell: Q235B and Q235C is not more than 16mm. The thickness of the steel plate used for other compression elements: Q235B is not more than 30mm, Q235C is not more than 40mme
It should not be used in media with extreme or high toxicity levels.