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牌號
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30Mn2優(yōu)質(zhì)合金結(jié)構(gòu)鋼 冷鐓螺栓
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中國ISC
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A00302
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對應(yīng)標(biāo)準(zhǔn)
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GB /T 3077-2015
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合金結(jié)構(gòu)鋼
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Alloy structure steels
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歸類
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合金鋼
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性能
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強(qiáng)度 硬度 鍛壓性 易切削性 淬透性
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標(biāo)簽
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優(yōu)質(zhì)合金結(jié)構(gòu)鋼 冷鐓螺栓材料
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說明
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特性：30Mn2通常經(jīng)調(diào)質(zhì)處理之后使用，其強(qiáng)度高，韌性好，并具有優(yōu)良的耐磨性能，當(dāng)制造截面尺寸小的零件時，具有良好的靜強(qiáng)度和疲勞強(qiáng)度，拉絲、冷鐓、熱處理工藝性都良好，切削加工性中等，焊 接性尚可， 一般不做焊接件，需焊接時，應(yīng)將零件預(yù)熱到200℃以上，具有較高的淬透性，淬火變形小，但有過熱、脫碳敏感性及回火脆性
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應(yīng)用：用于制造汽車、拖拉機(jī)中的車架、縱橫梁、變速器齒輪、軸、冷鐓螺栓、較大截面的調(diào)質(zhì)件，也可制造心部強(qiáng)度較高的滲碳件，如起重機(jī)的后車軸等
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Ac1-加熱下臨界溫度，Ac3-亞共析鋼加熱上臨界溫度，Ms-馬氏體點(diǎn)，即馬氏體轉(zhuǎn)變開始溫度
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密度
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7.8 g/cm3
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30Mn2 化學(xué)元素成分含量(%)
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成分
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C
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Si
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Mn
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P
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S
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Cr
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Ni
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Cu
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Mo
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最小值
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0.27
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0.17
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1.4
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-
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-
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-
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-
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-
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-
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最大值
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0.34
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0.37
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1.8
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0.03
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0.03
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0.3
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0.3
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0.3
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0.1
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?未經(jīng)用戶同意不得有意加入本表中未規(guī)定的元素。應(yīng)采取措施防止從廢鋼或其他原料中帶入影響鋼性能的元素。
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?各牌號可按高級優(yōu)質(zhì)鋼或特級優(yōu)質(zhì)鋼訂貨，但應(yīng)在牌號后加字母A或E
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?高級優(yōu)質(zhì)鋼：P≤0.02%；S≤0.02%；Cu≤0.25%；Cr≤ 0.30%；Ni≤0.30%；Mo≤0.10%殘余
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?特級優(yōu)質(zhì)鋼：P≤0.02%；S≤0.01%；Cu≤0.25%；Cr≤ 0.30%；Ni≤0.30%；Mo≤0.10%殘余
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?熱壓力加工用鋼的銅含量不大于0.20%
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?鋼中的殘余鎢、釩、鈦含量應(yīng)作分析，結(jié)果記入質(zhì)量證明書中。根據(jù)需方要求，可對殘余鎢、釩、鈦含量加以限制。
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30Mn2 機(jī)械性能
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試樣直徑
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熱處理或狀態(tài)
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抗拉強(qiáng)度
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屈服點(diǎn)
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斷后伸長率或延伸率
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斷面收縮率
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硬度
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沖擊吸收能量
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d
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σb
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σs
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δ
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ψ
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HBW
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KV2
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mm
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Mpa
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Mpa
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%
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%
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J
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d=25
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淬火+回火
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≥785
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≥635
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≥12
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≥45
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≤207
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≥63
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1、表中力學(xué)性能適用于公稱直徑或厚度不大于80mm的鋼棒。公稱直徑或厚度大于80mm的鋼棒力學(xué)性能應(yīng)符合下列規(guī)定
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①公稱尺寸大于80~100mm的鋼棒，允許其斷后伸長率、斷面收縮率及沖擊吸收能量較表中規(guī)定分別降低1%（絕對值）、5%（絕對值）及5%
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②公稱尺寸大于100~150mm的鋼棒，允許其斷后伸長率、斷面收縮率及沖擊吸收能量較表中規(guī)定分別降低2%（絕對值）、10%（絕對值）及10%
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③公稱尺寸大于150~250mm的鋼棒，允許其斷后伸長率、斷面收縮率及沖擊吸收能量較表中規(guī)定分別降低3%（絕對值）、15%（絕對值）及15%
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④允許將取樣用坯改鍛（軋）成截面70mm~80mm后取樣，其檢驗(yàn)結(jié)果應(yīng)符合表中規(guī)定
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2、表中硬度為鋼材退火或高溫回火供應(yīng)狀態(tài)布氏硬度值
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3、表中沖擊吸收能量為U型缺口沖擊試驗(yàn)值
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4、硼鋼在淬火前可先經(jīng)正火，正火溫度應(yīng)不高于其淬火溫度，鉻錳鈦鋼第一次淬火可用正火代替。
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5、熱處理溫度允許調(diào)整范圍：淬火±15°C，低溫回火±20°C，高溫回火±50°C
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熱處理：
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淬火溫度840°C水冷；回火溫度500°C 水冷
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物理性能
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彈性模量E/GPa
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熱導(dǎo)率λ/W·(m·K)
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20°C
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100℃
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100℃
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211
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39.78
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36.01
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熱處理及硬度
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臨界溫度/℃
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熱加工溫度/℃
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退火
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正火
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高溫回火
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淬火
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回火
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Ac1
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Ac3
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Ms
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加熱
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始鍛
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溫度
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冷卻
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硬度
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溫度
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冷卻 方式
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硬度
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溫度
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硬度
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溫度
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淬火
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硬度
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各種不同溫度回火后的硬度值HRC
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/℃
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方式
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HBW
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/℃
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HBW
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/℃
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HBW
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/℃
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冷卻
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HRC
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Ar1
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Ar3
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Mf
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終鍛
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介質(zhì)
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150℃
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200℃
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300℃
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400℃
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500℃
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550℃
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600℃
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650℃
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718
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804
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-
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1200
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1160
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830
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爐冷
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≤207
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840~880
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空冷
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-
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680~720
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≤207
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820~850
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油
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≥49
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48
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47
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45
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36
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26
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24
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18
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11
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~1220
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~1200
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~860
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627
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727
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-
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＞800
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