सूरीQ235B straight seam welded pipeउत्पाद का बुनियादी ज्ञान
709HP1805184932बहुत साल पहले 278
Steel plate materials mainly include Q, Q, , cimo and cimo, with manganese and manganese capacity...
सूरीQ235B straight seam welded pipeआप के बारे में कितना जानते हैं
709HP1805184932बहुत साल पहले 273
If the top wall thickness of the pipe is equal to the bottom wall thickness, the formula can also be...