方管在使用状态下以铁素体组织为主的叫合金方管。含铬量在11%~30%,具有体心立方晶体结构。这类钢一般不含镍,有时还含有少量的Mo、Ti、Nb等到元素,这类钢具导热系数大,膨胀系数小、抗氧化性好、抗应力腐蚀优良等特点,多用于制造耐大气、水蒸气、水及氧化性酸腐蚀的零部件。这类合金方管存在塑性差、焊后塑性和耐蚀性明显降低等缺点,因而限制了它的应用。炉外精炼技术(AOD或VOD)的应用可使碳、氮等间隙元素大大降低,因此使这类钢获得广泛应用。
The square tube is called alloy square tube, which is mainly composed of ferrite in service state. The chromium content ranges from 11% to 30%. It has a body-centered cubic crystal structure. This kind of steel generally does not contain nickel, and sometimes contains a small amount of Mo, Ti, Nb and other elements. This kind of steel tool has the characteristics of high thermal conductivity, small expansion coefficient, good oxidation resistance and excellent stress corrosion resistance. It is mostly used to manufacture parts resistant to atmospheric, steam, water and oxidative acid corrosion. This kind of alloy square pipe has some shortcomings, such as poor plasticity, obvious decrease of post-weld plasticity and corrosion resistance, which limits its application. The application of out-of-furnace refining technology (AOD or VOD) can greatly reduce the gap elements such as carbon and nitrogen, thus making this kind of steel widely used.
短期内西安方管价格或以暂稳运行以出货为主…方管西安方管市场价格小幅上涨。情绪方面,通过和方管厂家联系得到的反映,今日期盘持续上涨趋势,方管厂家表示还是以出货为主,价格向上调整上涨30元/吨。方管厂家表示库存不多,库存量 整体减少,表示近期部分钢厂到货速度较慢;出货方面,方管厂家反映出货量显示整体较好,西安方管大户出货量在300吨左右,中小户也有100吨上下… 天津镀锌方管市场价格主流暂稳厂家利润较少…方管天津镀锌方管市场价格主流暂稳。市场方面,首钢4620-4700元,天铁大卷4480-4520元,月底受资金与完成销售额下,以平盘回款为主操作,不过本周华 北地区各大方管厂家陆续出台10月份价格结算政策,结算价格较上月有所增加,方管厂家利润较少。心态方面,由于订货成本的增加,方管厂家也不愿牺牲利润降价出货。 综合考虑,预计当…
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