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Wuxi Tianchen Cold-Drawn Steel Co., Ltd.

Square Steel Bar

Tianchen cold-drawn square steel bars are precision-engineered to deliver excellent strength and versatility for a wide range of industrial applications. Manufactured through a precise process of heat treatment, shot blasting, and cold drawing using tungsten carbide dies, our square bars guarantee tight dimensional tolerances and a smooth, clean surface finish. Supplied in various steel grades including 45#, 40Cr, and Q235, every bar is straightened rigorously and undergoes comprehensive quality inspection before shipment. Ideal for structural supports, machine frames, construction parts, and general engineering applications, our square steel bars effectively reduce machining waste and enhance assembly efficiency. We support flexible order quantities and provide reliable delivery to customers throughout Europe, Southeast Asia, and global markets. Choose Tianchen as your trusted partner for consistent quality and competitive pricing.

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  Square Steel Bar

ShapeSpecifications (mm)Roughness Ra (µm)Length (m)
Square Steel4×4 – 90×90≤1.62.5–8.0, Customizable
Flat Steel3×8 – 10×120≤1.62.5–8.0, Customizable
Hexagon SteelS6 – S75≤1.62.5–8.0, Customizable
RemarkCustomizable Cold-Drawn Profiles / Shaped Steel Wire

Product Accuracy Grades and Tolerances

Size (mm)h9h10h11
>3-60, -0.0300, -0.0480, -0.075
>6-100, -0.0360, -0.0580, -0.090
>10-180, -0.0430, -0.0700, -0.110
>18-300, -0.0520, -0.0840, -0.130
>30-500, -0.0620, -0.1000, -0.160
>50-800, -0.0740, -0.1200, -0.190


Application of Square Steel Bar

steel for intelligent devices
steel for intelligent devices
steel for cars
steel for cars
steel for green building
steel for green building
stainless steel for marine use
stainless steel for marine use
steel for electrical tools
steel for electrical tools
steel for interlligent robot
steel for interlligent robot
rail steel
rail steel
steel for guide rail
steel for guide rail
steel for electric power equipment
steel for electric power equipment
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