GB/T 13320-2025 Active National standards

GB/T 13320-2025 Metellographic grading atlas and assessing method for steel die forgings

Publish Date: 2025-12-31 Implement Date: 2026-07-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 13320-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Forging and pressing

ICS Name: \nSteel forgings

Publish Date: 2025-12-31

Implement Date: 2026-07-01

Pages: 28 pages

Scope

This document describes the metallographic structure rating chart (hereinafter referred to as "rating chart") and evaluation method for steel forging parts.
This document is applicable to structural steel forging parts that have undergone quenching and tempering, normalizing treatment, isothermal normalizing treatment, and post-forging cooling treatment.
This document is not applicable to the evaluation of forging parts with decarburization, overheating, or overburning structures.

Development Information

Word Count: 46 Thousand words Pages: 28 pages

Replace the following standards

GB/T 13320-2007 Metellographic grading atlas and assessing method for steel die forgings

Referenced Standards

GB/T 225-1988 Steel-hardenability test by end quenching(Jominy test) GB/T 225-2006 Steel—Hardenability test by end quenching (Jominy test) GB/T 6394-2002 Metal-methods for estimating the average grain size GB/T 6394-2017 Determination of estimating the average grain size of metal GB/T 7232-1999 Terminology of metal heat treatment GB/T 7232-2012 Terminology of metal heat treatment GB/T 7232-2023 Metal heat treatment—Terminology GB/T 8541-1997 Terminology of forging and stamping GB/T 8541-2012 Terminology of forging and stamping GB/T 13298-1991 Metal—Inspection method of microstructure GB/T 13298-2015 Inspection methods of microstructure for metals

Related Standards

GB/T 13320-2007 Replaced

GB/T 13320-2007 Metellographic grading atlas and assessing method for steel die forgings

Publish Date: 2007-04-18

GB/T 20911-2007 Active

GB/T 20911-2007 Semi finished products for forging—Tolerances on dimensions shape and mass

Publish Date: 2007-04-18

GB/T 21469-2008 Active

GB/T 21469-2008 Machining allowances and tolerances for steel open die forgings on hammer—General requirement

Publish Date: 2008-02-28

GB/T 21470-2008 Active

GB/T 21470-2008 Machining allowances and tolerances for steel open die forgings on hammer—Disks,columns,rings and seamless cylindrical sleeves

Publish Date: 2008-02-28

GB/T 21471-2008 Active

GB/T 21471-2008 Machining allowances and tolerances for steel open die forgings on hammer—Shafts

Publish Date: 2008-02-28

GB/T 22131-2008 Replaced

GB/T 22131-2008 Practice for ultrasonic examination from bored surfaces of cylindrical forgings

Publish Date: 2008-06-25