Sign In |Help & Support
HOMECHINA STANDARDSICS CLASSIFICATIONINDUSTRY CLASSIFICATIONCHINESE CLASSIFICATIONCART(0)
ALL SECTORS
  • ALL SECTORS
  • GB(National Standard)
  • CB(Shipping)
  • CECS(Engineering Construction)
  • CJ(Urban Construction)
  • CY(News and Publication)
  • DB(Provincial Standard)
  • DL(Electricity & Power)
  • DZ(Geology & Mineralogy)
  • FZ(Spinning & Textile)
  • GA(Public Security)
  • HB(Aviation)
  • HG(Chemical Industry)
  • HJ(Environmental Protection)
  • JB(Machinery)
  • JC(Building Materials)
  • JG(Building & Construction)
  • JJ(Metering)
  • JT(Highway & Transportation)
  • LY(Forestry)
  • MT(Coal)
  • NB(Energy)
  • NY(Agriculture)
  • QB(Light Industry)
  • QC(Automobile & Vehicle)
  • QJ(Aerospace)
  • SH(Petrochemical)
  • SJ(Electronics)
  • SL(Water Resources)
  • SN(Commodity Inspection)
  • SY(Oil & Gas)
  • TB(Railway & Train)
  • YB(Ferrous Metallurgy)
  • YC(Tobacco)
  • YD(Telecommunication)
  • YY(Medical Device)
Database: 365,228(8 Aug 2026)
purpose industrial valves-diaphragm valves scopethis standard tidal energy survey measurement environment requirements
  1. HOME
  2. GJB 904B-2019 in English
GJB 904B-2019 in English

GJB 904B-2019 in English

VALID

Quality control for forging process

  • Issued on:2019-12-08
  • Implemented on:2020-01-01
  • File Format:PDF
  • Delivery:Via email within 1~3 business days
Price(USD)： $220.00
$214.00


Introduction

Standard Evolution and Core Changes

Technical Field GJB 904A-1999 GJB 904B-2019 Upgrade Points
Process Type Traditional Forging Newly Added Isothermal Forging Isotemperature Control of Die and Billet
Equipment Requirements Conventional Equipment Digital Control Forging Equipment Data Collection Interval≤0.5s
Environmental control Basic requirements Special requirements for wastewater discharge Newly added GB 8978 compliance

Interpretation of key technical specifications

1. Digital equipment management

The standard requires that a sensor calibration system must be established for digital controlled forging equipment, and the data storage system must fully record the three sets of core parameter curves of position-time, speed-time, and load-time.

2. Special requirements for isothermal forging

  • The power of the mold heating device needs to be verified by calculation
  • A dual thermocouple redundant system must be configured
  • Temperature recording interval ≤ 5 minutes

Implementation suggestions

Upgrade path for military enterprises

  1. Personnel training: Process auditors must have engineer titles
  2. Equipment transformation: Traditional hydraulic presses are equipped with data acquisition modules
  3. File system: Establish a dual backup system for electronic records

Comparative analysis of new and old standards

Control dimensions Delete content Add content
Material Management Mandatory Identification of Raw Materials Process Change Review Requirements
Heating Equipment YI Type Heating Furnace Special Furnace for Quasi-β Forging of Titanium Alloy

More samples: YD/T 3934-2021 DL/T 5154-2012 DL/T 368-2010
Sample only — not a preview of GJB 904B-2019
Page: 1 / 0
100%

Loading PDF document...

Error loading PDF. Please make sure the file is valid and try again.

We also recommend

All Rights Reserved © 2026 WWW.CHINASTANDARDS.NET visa master american express unionpay apple pay paypal google pay