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銆€API 浜� 1926 骞寸櫦(f膩)甯� APl5L 妯�(bi膩o)婧�(zh菙n)锛屾渶鍒濆彧鍖呮嫭 A25 銆� A 銆� B 涓夌ó閶肩礆(j铆)锛屾渶灏忓眻鏈嶅€煎垎鍒ョ偤 172 銆� 207 銆� 251MPa 銆� 銆€銆€
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1966 骞撮枊(k膩i)濮�锛屽厛鍚庣櫦(f膩)甯冧簡 X56 銆� X60 銆� X65 銆� X70 鍥涚ó閶肩礆(j铆)锛屽叾鏈€灏忓眻鏈嶅€煎垎鍒ョ偤 386 銆� 413 銆� 448 銆� 482MPa 銆� 銆€銆€
1972 骞� API 鐧�(f膩)甯� U80 銆� U100 妯�(bi膩o)婧�(zh菙n)锛屽叾鏈€灏忓眻鏈嶅€煎垎鍒ョ偤 551 銆� 691Mpa 锛屼互鍚� API 鍙堝皣 U80 銆� U100 鏀圭偤 X80 銆� X100 銆� 銆€
銆€绮楃暐绲�(t菕ng)瑷�(j矛)锛屽叏涓栫晫 2000 骞翠互鍓� X70 鐢ㄩ噺鍦� 40 %宸﹀彸锛� X65 銆� X60 鍧囧湪 30 %宸﹀彸寰樺緤锛屽皬鍙ｅ緫鎴愬搧娌圭绶�(xi脿n)涔熸湁鐩哥暥(d膩ng)鏁�(sh霉)閲忛伕鐢� X52 閶肩礆(j铆)锛屼笖澶氱偤 ERW 閶肩銆�
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C锛氣墹0.21 Si鈮�0.45 Mn鈮�1.60 P鈮�0.020 S鈮�0.010 V鈮�0.15 Nb鈮�0.05 Ti鈮�0.04
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