合金鋼的牌號(hào)表示方法.doc

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1、1牌號(hào)表示方法?鋼的牌號(hào)由代表屈服點(diǎn)的漢語(yǔ)拼音字母(Q)、屈服點(diǎn)數(shù)值、質(zhì)量等級(jí)符號(hào)(A、B、C、D、E)三個(gè)部分按順序排列。???例如：Q390A???其中：???Q——鋼材屈服點(diǎn)的“屈”字漢語(yǔ)拼音的首位字母：???390——屈服點(diǎn)數(shù)值．單位MPa；A、B、C、D、E——分別為質(zhì)量等級(jí)符號(hào)?！　?主要技術(shù)要求　　2．1牌號(hào)和化學(xué)成分牌號(hào)和化學(xué)成分(熔煉分析)應(yīng)符合表1規(guī)定。合金元素含量應(yīng)符合GB／T13304對(duì)低合金鋼的規(guī)定：????????表l牌號(hào)質(zhì)量等級(jí)???化???學(xué)???成．?分，???%?C?≤???Mn?Si?≤?P?≤?S?≤???V???Nb?

2、??Ti?AI?≥?Cr?≤?Ni?≤Q295?A?B?0.16?q．16?0.80～1.50?0.80～1.50?O.55?0.550.0450.0400.0450.040?0.02～0.15?0.02～O.150.015～0.0600.015～0.060?0.02～0.20?0.02～0.20--??Q345?A?B?C?D?EO.20O.200.20O.18O181.OO～1.60?1.OO～1.60?1.00～I(xiàn)．60?1.OO～1.60?1.OO～1.60?O．55?O．55?O．55?0.55?0.550.0450.0400.0350.0300.0

3、250.0450.0400.0350.0300.0250.02～0.15?0.02～0.15?0.02～0.15?0.02～0.15?0.02～O．150.015～O.0600.015～0.06C0.015～0.0600.015～0.0600.015～0.060?0.02～0.20?O.02～O.20?0.02～0.20?0.02～0.20?0.02～0.20??O.015O.0150.015Q390?A?B?C?D?O．20?O．20?O．20?O．20?1.OO～1.60?1.OO～1.601.OO～1.60?0.55?0.55?0.55?0.550.04

4、50.0400.0350.0300.0450.0400.0350.0300.02～0.20?0.02～O．20?0.02～0.200.015～0.0600.015～0.0600.015～0.06C?0.02～0.20?0.02～0.20?0.02～0.20?0.02～0.20??0.0150.0150.015?O．30?0.30?O.30?O.30?O.70?O.70?0.70?0.70?E?O．20?1.00～1.60?1.OO～1.60?0.550.0250.025?0.02～0.20?0.02～0.200.015～0.06C0.015～0.060?0.0

5、2～O．20?0.30?0.70Q420?A?B?C?D?E?0.20?O．20?0.20?0.20?0.20?1．OO～1.70?1．OO～1.70?I．OO～1.70?1.00～1.70?1．OO～1.70?0.55?0.55?0.55?0.55?0.550.0450.0400.0350.0300.0250.0450.0400.0350.0300.025?0.02～0.20?0.02～O．20?0.02～0.20?0.02～0.20?0.02～O．200.015～0.0600.015～0.0600.015～0.0600.015～0.0600.015～0.0

6、60?0.02～0.20?0.02～O．20?0.02～0.20?0.02～0.20?0.02～0.20——0.0150.0150.015?0.40?0.40?0.40?0.40?0.40?O．70?O．70?0.70?0.70?O．70??C?0.20?1．OO～1.70?O．550.0350.035?0.02～0.200.015～0.060?0.02～0.20O．015?O．70?0.70?Q460??D?E?0.20?0.20?1．OO～1.70?I．00～1.70?0.55?0.550.0300.0250.0300.025?0.02～0.20?0.02

7、～O．200.0i5～0.0600.015～0.060?0.02～0.20?0.02～0.200.0150.015?O．70?0.70?0.70?0.70?注：表中的Al為全鋁含量。如化驗(yàn)酸溶鋁時(shí)，其含量應(yīng)不小于0．010％?！　?．1．1?Q295的碳含量到o．18％也可交貨?！　?．1．2?不加V、Nb、Ti的Q295級(jí)鋼，當(dāng)C≤o．12％時(shí)，Mn含量上限可提高到1．80％。　　2．1．3?Q345級(jí)鋼的Mn含量上限可提高到1．70％。　　2．1．4?厚度≤6mm的鋼板、鋼帶和厚度≤16mm的熱連軋鋼板、鋼帶的Mn含量下限可降低0.20％?！　?．1．5?

8、?在保證鋼材力學(xué)性能符合本標(biāo)準(zhǔn)規(guī)定的情