| 发明名称 |
ULTRAHIGH-STRENGTH GAS METAL ARC WELDED JOINT HAVING EXCELLENT IMPACT TOUGHNESS, AND SOLID WIRE FOR PRODUCING SAME |
| 摘要 |
Provided is an ultrahigh-strength gas metal arc welded joint having a high degree of impact toughness. The ultrahigh-strength gas metal arc welded joint comprises, by wt %, carbon (C): 0.05% to 0.1%, silicon (Si): 0.2% to 0.7%, manganese (Mn): 1.5% to 2.5%, nickel (Ni): 2.0% to 3.5%, chromium (Cr): 0.3% to 0.9%, copper (Cu): 0.1% to 0.3%, molybdenum (Mo): 0.5% to 0.8%, titanium (Ti): 0.02% to 0.04%, boron (B): 0.002% to 0.005%, aluminum (Al): 0.001% to 0.03%, nitrogen (N): 0.002% to 0.007%, phosphorus (P): 0.03% or less, sulfur (S): 0.03% or less, oxygen (O): 0.02% to 0.05%, and a balance of iron (Fe) and other inevitable impurities, satisfying 0.4≦Ti/O≦1.2., 2.8≦Ti/N≦9.0, 10≦(2Ti+5B)/N≦20, and 3.5≦Mn+2Cr+3Mo+3Cu≦7.5. |
| 申请公布号 |
US2016319408(A1) |
申请公布日期 |
2016.11.03 |
| 申请号 |
US201315104707 |
申请日期 |
2013.12.24 |
| 申请人 |
POSCO |
发明人 |
JEONG Hong-Chul;LEE Dong-Ryeol;KIM Geug |
| 分类号 |
C22C38/58;C22C38/48;C22C38/46;C22C38/44;C22C38/42;C22C38/54;C22C38/06;C22C38/02;C22C38/00;B23K35/30;C22C38/50 |
主分类号 |
C22C38/58 |
| 代理机构 |
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代理人 |
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| 主权项 |
1. An ultrahigh-strength gas metal arc welded joint having a high degree of impact toughness, the ultrahigh-strength gas metal arc welded joint comprising, by wt %, carbon (C): 0.05% to 0.1%, silicon (Si): 0.2% to 0.7%, manganese (Mn): 1.5% to 2.5%, nickel (Ni): 2.0% to 3.5%, chromium (Cr): 0.3% to 0.9%, copper (Cu): 0.1% to 0.3%, molybdenum (Mo): 0.5% to 0.8%, titanium (Ti): 0.02% to 0.04%, boron (B): 0.002% to 0.005%, aluminum (Al): 0.001% to 0.03%, nitrogen (N): 0.002% to 0.007%, phosphorus (P): 0.03% or less, sulfur (S): 0.03% or less, oxygen (O): 0.02% to 0.05%, and a balance of iron (Fe) and other inevitable impurities,
wherein contents of titanium (Ti) and oxygen (O) satisfy Formula 1 below, contents of titanium (Ti) and nitrogen (N) satisfy Formula 2 below, contents of titanium (Ti), boron (B), and nitrogen (N) satisfy Formula 3 below, and contents of manganese (Mn), chromium (Cr), molybdenum (Mo), and copper (Cu) satisfy Formula 4 below, wherein the ultrahigh-strength gas metal arc welded joint has a microstructure comprising acicular ferrite in an area fraction of 20% to 30% and bainite in an area fraction of 70% to 80%,
0.4≦Ti/O≦1.2 [Formula 1]2.8≦Ti/N≦9.0 [Formula 2]10≦(2Ti+5B)/N≦20 [Formula 3]3.5≦Mn+2Cr+3Mo+3Cu≦7.5 [Formula 4] |
| 地址 |
Pohang-si KR |
