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薄板的寬度為500~1500毫米；厚的寬度為600~3000毫米。薄板按鋼種分，有普通鋼、優質鋼、合金鋼、彈簧鋼、不銹鋼、工具鋼、耐熱鋼、軸承鋼、硅鋼和工業純鐵薄板等；按專業用途分，有油桶用板、搪瓷用板、防彈用板等；按表面涂鍍層分，有鍍鋅薄板、鍍錫薄板、鍍鉛薄板、塑料復合鋼板等。> 厚鋼板的鋼種大體上和薄鋼板相同。在品各方面，除了 厚鋼板的鋼種大體上和薄鋼板相同。在品各方面，除了橋梁鋼板、鍋爐鋼板、汽車制造鋼板、壓力容器鋼板和多層高壓容器鋼板等品種純屬厚板外，有些品種的鋼板如汽車大梁鋼板（厚2.5~10毫米）、花紋鋼板（厚2.5~8毫米）、不銹鋼板、耐熱鋼板等品種是同薄板交叉的。
鋼板還有材質一說，并不是所有的鋼板都是一樣的，材質不一樣，其鋼板所用到的地方，也不一樣。

厚(hou)(hou)(hou)(hou)(hou)(hou)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)是(shi)厚(hou)(hou)(hou)(hou)(hou)(hou)度(du)(du)(du)(du)在(zai)(zai)4mm以上的(de)(de)(de)(de)(de)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)的(de)(de)(de)(de)(de)統稱，在(zai)(zai)實際(ji)工作中，常將(jiang)厚(hou)(hou)(hou)(hou)(hou)(hou)度(du)(du)(du)(du)小于(yu)20mm的(de)(de)(de)(de)(de)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)稱為(wei)中板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)，厚(hou)(hou)(hou)(hou)(hou)(hou)度(du)(du)(du)(du)>的(de)(de)(de)(de)(de)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)稱為(wei)厚(hou)(hou)(hou)(hou)(hou)(hou)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)，厚(hou)(hou)(hou)(hou)(hou)(hou)度(du)(du)(du)(du)>60mm的(de)(de)(de)(de)(de)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)則需在(zai)(zai)專門的(de)(de)(de)(de)(de)特厚(hou)(hou)(hou)(hou)(hou)(hou)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)軋(ya)機上軋(ya)制(zhi)，故稱特厚(hou)(hou)(hou)(hou)(hou)(hou)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)。厚(hou)(hou)(hou)(hou)(hou)(hou)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)的(de)(de)(de)(de)(de)寬度(du)(du)(du)(du)從(cong)。厚(hou)(hou)(hou)(hou)(hou)(hou)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)按(an)(an)(an)用途(tu)又分(fen)造船鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、橋梁(liang)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、鍋爐(lu)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、高壓容(rong)器鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、花紋(wen)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、汽車(che)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、裝甲鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)和復合(he)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)等(deng)。 鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)是(shi)平板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)狀，矩形的(de)(de)(de)(de)(de)，可(ke)直(zhi)接(jie)軋(ya)制(zhi)或由寬鋼(gang)(gang)(gang)帶(dai)剪切而成。鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)按(an)(an)(an)厚(hou)(hou)(hou)(hou)(hou)(hou)度(du)(du)(du)(du)分(fen)，薄(bo)(bo)(bo)(bo)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)<4毫(hao)(hao)米(mi)（薄(bo)(bo)(bo)(bo)0.2毫(hao)(hao)米(mi)），厚(hou)(hou)(hou)(hou)(hou)(hou)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)4~60毫(hao)(hao)米(mi)，特厚(hou)(hou)(hou)(hou)(hou)(hou)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)60~115毫(hao)(hao)米(mi)。鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)按(an)(an)(an)軋(ya)制(zhi)分(fen)，分(fen)熱(re)軋(ya)的(de)(de)(de)(de)(de)和冷(leng)軋(ya)的(de)(de)(de)(de)(de)。薄(bo)(bo)(bo)(bo)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)的(de)(de)(de)(de)(de)寬度(du)(du)(du)(du)為(wei)500~1500毫(hao)(hao)米(mi)；厚(hou)(hou)(hou)(hou)(hou)(hou)的(de)(de)(de)(de)(de)寬度(du)(du)(du)(du)為(wei)600~3000毫(hao)(hao)米(mi)。薄(bo)(bo)(bo)(bo)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)按(an)(an)(an)鋼(gang)(gang)(gang)種(zhong)分(fen)，有(you)普(pu)通鋼(gang)(gang)(gang)、優(you)質(zhi)鋼(gang)(gang)(gang)、合(he)金鋼(gang)(gang)(gang)、彈(dan)簧鋼(gang)(gang)(gang)、不(bu)銹鋼(gang)(gang)(gang)、工具鋼(gang)(gang)(gang)、耐熱(re)鋼(gang)(gang)(gang)、軸承鋼(gang)(gang)(gang)、硅鋼(gang)(gang)(gang)和工業純鐵(tie)薄(bo)(bo)(bo)(bo)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)等(deng)；按(an)(an)(an)專業用途(tu)分(fen)，有(you)油桶用板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、搪瓷用板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、防彈(dan)用板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)等(deng)；按(an)(an)(an)表(biao)面涂(tu)鍍層分(fen)，有(you)鍍鋅薄(bo)(bo)(bo)(bo)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、鍍錫薄(bo)(bo)(bo)(bo)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、鍍鉛(qian)薄(bo)(bo)(bo)(bo)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、塑(su)料(liao)復合(he)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)等(deng)。厚(hou)(hou)(hou)(hou)(hou)(hou)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)的(de)(de)(de)(de)(de)鋼(gang)(gang)(gang)種(zhong)大(da)體(ti)上和薄(bo)(bo)(bo)(bo)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)相同。在(zai)(zai)品各方面，除了橋梁(liang)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、鍋爐(lu)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、汽車(che)制(zhi)造鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、壓力容(rong)器鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)和多層高壓容(rong)器鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)等(deng)品種(zhong)純屬厚(hou)(hou)(hou)(hou)(hou)(hou)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)外，有(you)些品種(zhong)的(de)(de)(de)(de)(de)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)如汽車(che)大(da)梁(liang)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)（厚(hou)(hou)(hou)(hou)(hou)(hou)2.5~10毫(hao)(hao)米(mi)）、花紋(wen)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)（厚(hou)(hou)(hou)(hou)(hou)(hou)2.5~8毫(hao)(hao)米(mi)）、不(bu)銹鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)、耐熱(re)鋼(gang)(gang)(gang)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)等(deng)品種(zhong)是(shi)同薄(bo)(bo)(bo)(bo)板(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)(ban)交叉的(de)(de)(de)(de)(de)。

Q235中厚板，又稱中厚板普板 材質：Q235，普通碳素鋼
Q235中厚板化學參數：0.12 ≤ C ≤ 0.20 ;  Si ≤ 0.30 ;  0.30 ≤ Mn ≤ 0.70 ;  S ≤ 0.45 ;   P ≤ 0.045
中厚板普板力學性能 Q235 屈服強度：235MPa  24kg/mm2 ； 抗拉強度：375-460MPa 38-47kg/mm2 ; 伸長率：26min
Q235z中厚板厚度：4mm-25mm
中厚板主要應用于建筑工程、機械制造、容器制造、造船、橋梁建造等。還可以用來制造各種容器、爐殼、爐板、橋梁及汽車靜鋼鋼板、低合金鋼鋼板、造船鋼板、鍋爐鋼板、壓力容器鋼板、花紋鋼板、汽車大梁鋼板、拖拉機某些零件及焊接構件等。厚度雖小，但橫向剪力所引起的變形和彎曲變形屬同一量級，在分析靜載荷下的應力和變形時，仍須考慮橫向剪切效應，垂直于板面方向的正應力則可忽略。在分析動載荷下的應力和變形時，除考慮橫向剪切效應外，還須考慮段的慣性力和阻尼力矩。中厚板在機械工業中早已有廣泛應用。

45號鋼調質件淬火后的硬度應該達到HRC56~59，截面大的可能性低些，但不能低于HRC48，不然，就說明工件未得到完全淬火，組織中可能出現索氏體甚至鐵素體組織，這種組織通過回火，仍然保留在基體中，達不到調質的目的。
45號鋼淬火后的高溫回火，加熱溫度通常為560~600℃，硬度要求為HRC22~34。因為調質的目的是得到綜合機械性能，所以硬度范圍比較寬。但圖紙有硬度要求的，就要按圖紙要求調整回火溫度，以保證硬度。如有些軸類零件要求強度高，硬度要求就高；而有些齒輪、帶鍵槽的軸類零件，因調質后還要進行銑、插加工，硬度要求就低些。關于回火保溫時間，視硬度要求和工件大小而定，我們認為，回火后的硬度取決于回火溫度，與回火時間關系不大，但必須回透，一般工件回火保溫時間總在一小時以上。
鋼板是用鋼水澆注，冷卻后壓制而成的平板狀鋼材。是平板狀，矩形的，可直接軋制或由寬鋼帶剪切而成。<鋼板按厚度分，薄鋼板<4毫米（薄0.2毫米），中厚鋼板4~60毫米，特厚鋼板60~115毫米。鋼板按軋制分，分熱軋和冷軋。