Dab tsi yog qhov kev ua tau zoo ntawm Q690D high-strength steel phaj?Q690D high-strength steel phaj yog txias-kuav los tiag steel phaj uas nws lub ntsiab Cheebtsam yog carbon, silicon, manganese, phosphorus, sulfur, chromium, npib tsib xee, molybdenum thiab lwm yam khoom.Piv nrog rau qhov qub ...
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