GB/T 28415-2023

Steel plates and strips for refractory structures (English Version)

Standard No.

GB/T 28415-2023

Language

Chinese, Available in English version

Release Date

2023

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 28415-2023

Replace

GB/T 28415-2012

Scope

This document specifies the grade representation method, ordering content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of steel plates and steel strips for fire-resistant structures. This document is applicable to steel plates with a thickness of no more than 150 mm and steel strips with a thickness of no more than 25.4 mm and their sheared steel plates (hereinafter referred to as steel plates and steel strips) mainly used for the manufacture of general structures and engineering structures with fire-resistant properties.

Introduction

Interpretation of the National Standard of the People's Republic of China GB/T 28415—2023

Standard Items	GB/T 28415—2012	GB/T 28415—2023
New Steel Grades	None	New Q500FR, Q550FR, Q620FR, Q690FR
Chemical Composition Requirements	Basic Requirements	Optimize the Element Content Range, Add Mo and Cr Element Indexes
Mechanical Properties Standards	Basic tensile and yield strength	Improve impact absorption energy requirements and refine high-temperature tensile performance parameters

Standard revision background and technical evolution analysis

GB/T 28415 series standards are mainly used to guide the production and application of steel plates and strips for fire-resistant structures. With the improvement of fire resistance requirements in the construction industry, the new version of the standard has been optimized in the following aspects:

New high-strength steel grades

New high-strength fire-resistant steel grades such as Q500FR, Q550FR, Q620FR and Q690FR have been added, which significantly improve the yield strength and tensile properties of the material to meet the needs of high-rise buildings and complex structures.

Optimize chemical composition control

The requirements for molybdenum (Mo) and chromium (Cr) element content have been added on the original basis, and the fire resistance and high-temperature stability have been improved through alloying. At the same time, the total amount limit of niobium (Nb), vanadium (V) and titanium (Ti) has been refined.

Strengthening mechanical performance indicators

The impact absorption energy standards at room temperature and high temperature conditions have been improved, and new high-temperature tensile performance requirements have been added to ensure the reliability of materials under extreme conditions such as fire.

Implementation suggestions

To ensure the effective implementation of the new version of the standard:

• Design units should fully consider the mechanical properties of the new steel grade and optimize the structural design;
• Construction units need to strengthen the acceptance of materials entering the site and conduct inspections strictly in accordance with the standards;
• Supervision units should supervise the implementation of the standards to ensure material quality.

GB/T 28415-2023 Referenced Document

• GB/T 14977 General requirement for surface condition of hot-rolled steel plates
• GB/T 17505 Steel and steel products.General technical delivery requirements
• GB/T 20066 Steel and iron.Sampling and preparation of samples for the determination of chemical composition
• GB/T 20123 Steel and iron - Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method)
• GB/T 20125 Low-alloy steel.Determination of multi-element contents.Inductively coupled plasma atomic emission spectrometric method
• GB/T 222 Permissible tolerances for chemical composition of steel products
• GB/T 223.11 Determination of chromium content in iron, steel and alloy by visual titration or potentiometric titration
• GB/T 223.14 Methods for chemical analysis of iron,steel and alloy The N-benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content
• GB/T 223.17 Methods for chemical analysis of iron,steel and alloy--The diantipyrylmethane photometric method for the determination of titanium content
• GB/T 223.18 Methods for chemical analysis of iron steel and alloy.The sodium thiosulfate separation iodimetric method for the determination of cupper content
• GB/T 223.23 Iron,,steel and alloy.Determination of nickel content.The dimethylglyoxime spectrophotometric method
• GB/T 223.26 Iron,steel and alloy.Determination of molybdenum content.The thiocyanate spectrophotometric method
• GB/T 223.3 Methods for chemical analysis of iron, steel and alloy--The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content
• GB/T 223.68 Methods for chemical analysis of iron, steel and alloy. The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content
• GB/T 223.69 Iron,steel and alloy.Determination of carbon contents.Gas-volumetric method after combustion in the pipe furnace
• GB/T 223.79 Iron and steel-Determination of multi-element contents-X-ray fluorescence spectrometry (Routine method)
• GB/T 223.9 Iron,steel and alloy.Determination of aluminium content.Chrome azurol S photometric method
• GB/T 247 General rule of package,mark and certification for steel plates(sheets)and strips
• GB/T 2970 Method for ultrasonic testing of thicker steel plates
• GB/T 2975 Steel and steel products.Location and preparation of samples and test pieces for mechanical testing
• GB/T 4336 Determination of multi-element content in carbon steel and medium and low alloy steel Spark discharge atomic emission spectrometry (conventional method) Amendment No. 1
• GB/T 5313 Thickness direction performance steel plate*， 2023-09-07 Update
• GB/T 709 "Dimension,shape,weight and tolerance for hot rolled steel strip,plate and sheet"
• GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values

GB/T 28415-2023 history

• 2023 GB/T 28415-2023 Steel plates and strips for refractory structures
• 2012 GB/T 28415-2012 Fire-resistant structural steel plate and strip