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Q345D seamless pipe chemical composition:
C: ≤ 0.18 Si: 0.20-0.60 Mn: 1.00 - 1.60 P: ≤ 0.030 S: ≤ 0.030 Ni: ≤ 0.30 Cr ≤ 0.30 Cu: ≤ 0.20 Al: ≥ 0.015 V: 0.02-0.15 Nb: 0.015-0.06
Q345B seamless chemical composition:
C: 0.12-0.20 Si: 0.20-0.60 Mn: 1.00-1.60 P: 0.0 0.040 S: 0.0 0.040 Ni: 0.3 0.30 Cr: 0.3 0.30 Cu: 0.2 0.20 V: 0.02-0.15 Nb: 0.015-0.06
Q345A seamless pipe chemical composition:
C: 0.12-0.20 Si: 0.20-0.60 Mn: 1.00-1.60 P: ≤ 0.045 S: 0.0 0.045 Ni: 0.3 0.30 Cr: 0.3 0.30 Cu: 0.2 0.20 V: 0.02-0.15 Nb: 0.015-0.06
Q345C seamless pipe chemical composition:
C: 0.12-0.20 Si: 0.20-0.60 Mn: 1.00-1.60 P: 0.0 0.035 S: 0.0 0.035 Ni: 0.3 0.30 Cr: ≤ 0.30 Cu: 0.2 0.20 Al: 0.01 0.015 V: 0.02-0.15 Nb: 0.015-0.06
Q345E seamless pipe chemical composition:
C: ≤ 0.18 Si: 0.20-0.60 Mn: 1.00 - 1.60 P: ≤ 0.025 S: ≤ 0.025 Ni: ≤ 0.30 Cr ≤ 0.30 Cu: ≤ 0.20 Al: ≥ 0.015 V: 0.02-0.15 Nb: 0.015-0.06
Q345D seamless pipe mechanical properties:
Tensile strength: 490-675 Yield strength: ≥ 345 Elongation: ≥ 22
Q345B seamless pipe mechanical properties:
Tensile strength: 490-675 Yield strength: ≥ 345 Elongation: ≥ 21
Q345A seamless pipe mechanical properties:
Tensile strength: 490-675 Yield strength: ≥ 345 Elongation: ≥ 21
Q345C seamless pipe mechanical properties:
Tensile strength: 490-675 Yield strength: ≥ 345 Elongation: ≥ 22
Q345E seamless pipe mechanical properties:
Tensile strength: 490-675 Yield strength: ≥ 345 Elongation: ≥ 22
Q345A contains less than or equal to 0.045% phosphorus and sulfur
Q345B contains less than or equal to 0.040% phosphorus and sulfur
Q345C contains less than or equal to 0.035% phosphorus and sulfur
Q345D contains less than or equal to 0.030% phosphorus and sulfur
Q345E contains less than or equal to 0.025% phosphorus and sulfur
The more phosphorus and sulfur impurities in the steel, the worse the impact toughness. Source: http://?/24_3.html
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5 kinds of Q345 seamless pipe chemical composition, mechanical properties difference
5 kinds of Q345 seamless pipe chemical composition, mechanical properties difference