一、45#鋼板讀作：四十五號鋼
二、45#鋼板對照牌號：中國GB標準鋼號45；日本JIS標準鋼號S45C/S48C；德國DIN標準材料鋼號1.0503；德國DIN標準鋼號C45；英國BS標準鋼號IC45/080A47；法國AFNOR標準鋼號CC45,國際標準化組織ISO標準鋼號C45E4。
三、45#鋼板執行標準：GB/T711/WTB
No. 45 steel plate as standard
四、45#鋼板的產地：舞陽鋼鐵
Origin of 45# steel plate: Wuyang Steel
五、45#鋼板交貨狀態：正火、回火、淬火、調質
45# steel plate delivery status: normalizing, tempering, quenching and tempering
①、正火N：將鋼板加熱到適宜溫度在空氣中冷卻
②、回火T：將鋼板在某一適當溫度下進行長時間保溫在冷卻
③、淬火Q是將鋼板加熱保溫和在水油或其他無機鹽等介質中快速冷卻
④、調制：N+T 正火加回火
⑤、45號鋼淬火后沒有回火之前，硬度大于HRC55（可達HRC62)為合格。
⑥、實際應用的硬度為HRC55（高頻淬火HRC58)。
⑦、45號鋼不要采用滲碳淬火的熱處理工藝。
六、45#鋼板Z向性能可提供Z15、Z25、Z35
45# steel Plate Z provides Z15, Z25, Z35 for performance
Z向：是厚度方向性能鋼板的俗稱對于較厚的鋼板對其厚度方向的力學性能有特殊規定
七、45#鋼板也可提供探傷：
Flaw detection is also available for 45# steel plates
超聲波檢驗，又叫超聲波探傷，是針對鋼板內部重量進行檢驗的一種方法手段，可以檢驗鋼板內部的缺陷如（隱蔽裂紋，氣孔，沙眼，雜質等）分別為Ⅰ探、Ⅱ探、Ⅲ探
八、力學性能、
45#鋼板力學性能
抗拉強度
屈服強度
伸長率
收縮率
沖擊功
600Mpa
355Mpa
16%
40%
39J
45#鋼板交貨狀態的溫度
正火
淬火
回火
850
840
600
45#鋼板交貨狀態硬度
熱軋鋼
退火鋼
小余229HB
小余197HB
九、化學成分
主要成分為Fe（鐵元素），且含有以下少量元素：
20#鋼板主要化學成分%
C
Si
Mn
P
0.42-0.50
0.17-0.37
0.50-0.80
0.035
S
Cr
Ni
Cu
0.035
0.25
0.25
0.25
C：碳； Si：硅； Mn：錳； P：硫；
S：磷； Cr：鉻； Ni：鎳； Cu：銅
密度7.85g/cm3，彈性模量210GPa，泊松比0.269。
十、45#鋼板特性
No. 45 steel plate characteristics commonly used carbon quenched structural steel. The steel is generally cold plastic, annealing and normalizing are better than tempering, it has higher strength and better machinability, after proper heat treatment, certain toughness, plasticity and wear resistance can be obtained, and the material source is convenient. Suitable for hydrogen welding and argon arc welding, not suitable for gas welding. It is necessary to preheat before welding and stress relief annealing after welding. Normalizing can improve the cutting performance of blanks with hardness less than 160HBS. After quenching and tempering treatment, the comprehensive mechanical properties of the steel should be optimized for other medium carbon structural steels. However, the steel has low hardenability, critical quench diameter in water is 12~17mm, and cracking tendency occurs when water quenching. When the diameter is larger than 80mm, the mechanical properties are similar after tempering or normalizing, and the medium and small die parts can obtain higher strength and toughness after tempering, while the large parts should be normalized. Therefore, this steel is usually used in the state of tempering or normalizing.
十一、.處理要求
45鋼調質硬度在HRC20~HRC30之間；
45鋼淬火硬度在HRC55~58之間,極限值可達HRC62；
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