Carbon steel/Alloy steel equivalent steel grades comparison chart

Table of Contents

• Overview
• Comparison table of equivalent grades of carbon structural steel
• Comparison table of equivalent grades of high-quality carbon structural steel
• Comparison table of equivalent grades of alloy structural steel

Overview

Each country has its own steel standards. Steels with the same purpose have different grades in different countries. This article sorts out the equivalent grade comparison table of carbon steel and alloy steel. When purchasing steel, you can refer to the table below to find the steel with the corresponding grade.

Comparison table of equivalent grades of carbon structural steel

Introduction to the grade representation method of carbon steel (GB/T700-88):

Take Q235Bb as an example, where Q represents the yield strength of steel, the first letter of the pinyin of the word “Qu”; 235 represents the yield point (strength), the value is (MPa); B represents the quality grade: A, B, C, D; b represents one of the deoxidation methods, there are four deoxidation methods, b represents semi-killed steel, F represents boiling steel, Z represents killed steel (can be omitted), and TZ represents special killed steel.

Grade examples: Q195F, Q215AF, Q255A, Q275

Comparison table of equivalent grades of high-quality carbon structural steel

Introduction to the grade representation method of high-quality carbon steel (GB/T699-1999):

Take 08F, 45, 50Mn, 20A as an example, where the number (such as 50) represents the carbon content [w(C)]: expressed in average parts per thousand; Mn represents the manganese element: it is marked when the content is high [w(Mn)0.70%~1.00%], F represents a deoxidation method; A represents a quality grade, representing high-quality, and no symbol represents high-quality.

Comparison table of equivalent grades of alloy structural steel

Introduction to the grade representation method of alloy structural steel (GB/T3077-1999):

Take 25Cr2MoVA as an example, 25 represents the sulfur content, expressed in parts per thousand; Cr2MoV represents the chemical element symbol and content, expressed in percentages; A represents the quality grade, and the A mark represents high-quality steel with low sulfur and phosphorus content.