Carbon Steel Round Bar: Q235 Hot Rolled Steel Rod Guide

أ carbon steel round bar is the raw material of shafts, pins, fasteners, spindles and machined parts. This guide explains the Q235 hot rolled steel rod — its chemistry, mechanical properties, standard diameters and how to buy it. All sizes are available as Q235 carbon steel round bar from QIDAMT.

What Is a Carbon Steel Round Bar?

A round bar is a solid cylindrical steel section produced by hot rolling, with a circular cross-section. Chinese production follows جيجابايت/ت 702 for hot-rolled round bars, with the base grade Q235 to جيجابايت/ت 700. Round bars are the starting point for turning, threading, forging and machining, and they also serve directly as anchor bars, dowels and tie rods in construction.

التركيب الكيميائي (Q235)

الخصائص الميكانيكية

• Yield strength: ≥ 235 الآلام والكروب الذهنية
• Tensile strength: 370 - 500 الآلام والكروب الذهنية
• استطالة: ≥ 26 %
• كثافة: 7.85 g/cm³

Standard Round Bar Diameters

Bars over 100 mm are often forged or rolled-to-order. Tolerances follow GB/T 702 Group 2 unless otherwise specified.

التطبيقات

Round bars serve as shafts, pins, rollers, مسامير التثبيت, قضبان التعادل, reinforcement of frames, and raw stock for turned and machined parts. For flat sections in the same projects, combine them with Q235B carbon steel flat bar; for hollow sections, use 20# carbon steel seamless pipe.

Buying Checklist

• Specify diameter × length and total tonnage or piece count.
• Confirm the surface condition: black, peeled, or bright drawn.
• Ask whether cutting-to-length is available for large diameters.
• Check if the mill certificate is included; third-party inspection on request.
• Combine round bars, flat bars and angles in one container to optimize freight.