Q: What are the most common grades for general structural seamless steel pipes in China?
A: According to GB/T 8162, the most common grades are 10, 20, 35, 45, 40Cr, and Q345-1.
Q: Which grades are typically used for conveying fluids under pressure (like water, gas) according to GB/T 8163?
A: Common grades include 10#, 20#, Q235B, Q295, and Q345-1.
Q: What is the equivalent Chinese standard grade for ASTM A106 Grade C seamless pipe?
A: It corresponds to 25MnG according to GB5310-6.
Q: What are the typical applications for 20G seamless steel pipe?
A: 20G is a grade specified in GB5310 for high-pressure boiler tubes. It is used for parts like water wall panels, superheaters, and headers in power plant boilers where the service temperature is below 450°C-1.
Q: For low and medium-pressure boiler tubes (GB3087), which grades are primarily used?
A: Grades 10# and 20# are the primary choices-1.
