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Wuxi Tianchen Cold-Drawn Steel Co., Ltd.

Round Steel Bar

Precision cold-drawn round steel, premium steel, rigorous cold-drawing process. High accuracy, surface quality, mechanical strength. Tolerance ±0.03mm, Ra≤1.6μm, bright smooth finish, ready for deep processing, reducing steps, boosting efficiency. Widely used in precision machinery, automotive parts, hardware tools, hydraulic components, new energy equipment. Multiple materials, custom specs supported. Sufficient stock, timely delivery.

Tianchen Steel Grade Cross-Reference Table



Type of steelENASTMJISGB
Carbon steel / Low alloy steelS185(1.0035)、S235JR(1.0038)、E335(1.0060)……Grade B、Grade D、Grade 50……SS330、SS400、SS490……Q195、Q235、Q345……
Quality carbon steelC22(1.0402)、C35(1.0501)、C45(1.0503)……1020、1035、1045、1022……S10C、S20C、S35C、S45C20、35、45、20Mn……
Alloy structure steel33NiCrMo14-5(1.6956)、34CrNiMo6(1.6582)、30CrNiMo8(1.65803)、51CrV4(1.8159)、42CrMo4(1.7225)、16MnCr5(1.7131)、17CrNi6-6(1.5918)、20MnCrS5(1.7149)……1524、1340、5120、5140、4118、4135、4140、3316、4340……SMn420、SMn438、SCr420、SCr440、SCM420、SCM435、SCM440、SCN815、SNCM439……20Mn2、40Cr、20CrMo、35CrMo、42CrMo、20CrMnTi、20Cr2Ni4、40CrNiMo……
Cold heading steelC10C(1.0214)、C20C(1.0411)、C35EC(1.1172)、34CrMo4(1.7220)1012、1020、1030、1035、4135、4140、1518……SWRCH10A、SWRCH22A、SWARCH35K、SCM435、SWRCHB620……ML10AL、ML20、ML30、ML35、ML35CrMo、ML15MnB……
Spring steel61SiCr7(1.7108)、51CrV4(1.8159)、54SiCr6(1.7102)……1566、9260、6150……SWRH67B、SUP6、SUP7、SUP10……65Mn、60Si2Mn、50CrVA、55CrSi……
Bearing steel100Cr6E52100SUJ2GCr15
Stainless steel1.4016、1.4105、1.4006、1.4021、1.4301……430、430F、412、420、304……SUS430、SUS430F、SUS410、SUS420、SUS304……1Cr17、Y1Cr17、1Cr13、2Cr13、304……
Tooling steelC80U、C90U、C105U……W1A-8、W1A-81/2、W1A-91/2……SK80、SK90、SK105……T8、T9、T10……
Free cutting steel10S20(1.0726)、10SPb20(1.0722)、11SMn30(1.0715)、11SMnPb30(1.0718)、38SMn28(1.0760)……1112、11L08、1215、1213、12L14、1141……SUM21、SUM32、SUM22L、SUM42……Y12、Y12Pb、Y15、Y15Pb、Y40Mn……


Main Parameters of Customized Steel

φ3–φ100GrindingHigh precision cold drawingPrecision cold drawingStandard cold drawing
Precision Gradeh7h8h9h9
Roughness Ra (µm)0.400.801.601.60
Delivery ConditionCold Drawn, Cold Drawn + Ground, Q&T + Turned, Ground, Turned + Ground + PolishedCold Drawn, Cold Drawn + Ground, Q&T + Turned, Ground, Turned + Ground + PolishedCold Drawn, Cold Drawn + Ground, Q&T + Turned, Ground, Turned + Ground + PolishedCold Drawn, Cold Drawn + Ground, Q&T + Turned, Ground, Turned + Ground + Polished


Product Accuracy Grades and Tolerances 

Size (mm)h8h9
>3-60, -0.0300, -0.048
>6-100, -0.0360, -0.058
>10-180, -0.0430, -0.070
>18-300, -0.0520, -0.084
>30-500, -0.0620, -0.100
>50-800, -0.0740, -0.120


Application of Round Steel Bar

Steel for Electric Power Equipment
Steel for Electric Power Equipment
Steel for Guide Rail
Steel for Guide Rail
Rail steel
Rail steel
Steel for Intelligent Robot
Steel for Intelligent Robot
Steel for Electrical Tools
Steel for Electrical Tools
Stainless Steel for Marine Use
Stainless Steel for Marine Use
Steel for Green Building
Steel for Green Building
Steel for Cars
Steel for Cars
Steel for Intelligent Devices
Steel for Intelligent Devices
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