The present invention provides an alloy steel for UD21 integral forging frog. It belongs to the field of heat treatment of alloy steel, including the chemical components of the following weight percentage: C:0.17 0.25%, Si:0.9 1.3%, Mn:2.0 2.4%; Mo:0.3 0.4%; Cr:0.13 0.15%; Ni:0.34 0.45%; B:0.0003 0.0006%; Al:0 .015 ~ 0.02%; S: less than 0.015%; P: less than 0.015%, the allowance is Fe and unavoidable impurities. The invention also provides the heat treatment process of the UD21 alloy steel, including the following steps: (1) quenching and heating: heating evenly to 900 degrees centigrade, 2 and 2, to obtain austenite; (2) isothermal quenching: the workpiece enters 350 of 400 centigrade isothermal grooves, isothermal 1 1.5h, out of furnace cold, lower bainite; (3) tempering, cooling: workpiece (3): workpiece Enter the tempering furnace, evenly heat up to 190 3H 250 C, heat up 2 h, open the furnace door, air cool to room temperature, and organize as lower bainite. The UD21 alloy steel has high mechanical strength, high toughness, low hydrogen content and low residual austenite content. The heat treatment process of the UD21 alloy steel in the invention is simple and easy to be realized.
【技术实现步骤摘要】
一种整体锻压辙叉用合金钢及其热处理工艺
本专利技术涉及合金钢热处理
,具体是一种整体锻压辙叉用合金钢及其热处理工艺。
技术介绍
整体锻压辙叉是一种全新的辙叉产品,区别于铸造的高锰钢辙叉和拼装的合金钢组合辙叉,采用具有整体性好、韧性配合更好到合金钢材料整体锻压而成。氢损伤主要是氢导致塑性、韧性降低,脆性增加,简称氢脆。TB/T2344-2012《43kg/m-75kg/m钢轨订货技术条件》中6.2.3规定钢水氢含量不应大于2.5ppm。残余奥氏体组织硬度较低,应变后可诱发马氏体相变,致使工件表面和近表面出现微裂纹,随后扩展为麻面或剥落掉块等损伤,带来安全隐患。目前现有的钢轨和辙叉标准均没有对残余奥氏体含量进行规定。现有拼装的合金钢组合辙叉材料残余奥氏体含量均在10%-20%。针对上述问题,本专利技术提供了应用于整体锻压辙叉的UD21合金钢及其热处理工艺,以满足整体锻压辙叉的使用要求。
技术实现思路
本专利技术要解决的问题是:克服现有技术的不足,为整体锻压辙叉提供一种机械强度高,韧性高,含氢量低,残余奥氏体含量低的UD21合金钢及其热处理工艺。为解决上述技术问题,本 ...
【技术保护点】
一种UD21整体锻压辙叉用合金钢,其特征在于:包括如下重量百分比的化学组分:C:0.17‑0.25%;Si:0.9‑1.3%;Mn:2.0‑2.4%;Mo:0.3‑0.4%;Cr:0.13‑0.15%;Ni:0.34‑0.45%;B:0.0003‑0.0006%;Al:0.015~0.02%;S:≤0.015%;P:≤0.015%,余量为Fe和不可避免的杂质。
【技术特征摘要】
1.一种UD21整体锻压辙叉用合金钢,其特征在于:包括如下重量百分比的化学组分:C:0.17-0.25%;Si:0.9-1.3%;Mn:2.0-2.4%;Mo:0.3-0.4%;Cr:0.13-0.15%;Ni:0.34-0.45%;B:0.0003-0.0006%;Al:0.015~0.02%;S:≤0.015%;P:≤0.015%,余量为Fe和不可避免的杂质。2.根据权利要求1所述的一种UD21整体锻压辙叉用合金钢,其特征在于:包括如下重量百分比的化学组分:C:0.21%;Si:1.1%;Mn:2.2%;Mo:0.35%;Cr:0.14%;Ni:0.40%;B:0.0005%;Al:0.0175%;S:0.015%;P:0.015%,余量为Fe和不可避免的杂质。3.根据权利要求1或2所述的一种UD21整体锻压辙叉用合金钢,其特征在于:所述UD21整体锻压辙叉用合金钢的机械性能:抗拉强度≥1350Mpa,屈服强度≥1050Mpa,延伸率≥13%,断面率≥55%,洛氏硬度HRC38~45...
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