GB/T 11880-2024Die blocks for die forging hammers and large mechanical forging presses (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting is required.

This document replaces GB/T 11880-2008 "Technical Specifications for Die Forging Hammers and Large Mechanical Forging Presses" and is consistent with GB/T 11880-2008.

In addition to structural adjustments and editorial changes, the main technical changes are as follows.

The requirements for the chemical composition deviation of the module have been changed, the area interval division has been adjusted, and the Mo, V, and W components have been expanded. Scope (see Table 1, Table 2 in the 2008 edition);

Modified the module heat treatment requirements, and specified the corresponding hardness values according to different raw materials (see 4.3.1, 2008 edition) 3,9);

The cross-sectional dimensions have been increased, with 4 new widths and 4 new heights (see Table 4); - The requirements for forging process have been changed (see 4.2, 3.6 of the 2008 edition); - The requirements for internal quality have been changed (see 4.3.3, 3.7, 3.8, 3.10 of the 2008 edition); - Added test methods for chemical composition, metal flow lines, macrostructure, non-metallic inclusions, surface quality and size (see Table 5);

The ultrasonic testing method has been changed (see Table 5, 4.5 of the 2008 edition); - The batching rules have been changed to apply to all inspection items (see 6.1, 4.3 of the 2008 edition); - Added the requirements for sampling quantity and sampling location for each inspection item (see 6.2); - Added retest and judgment rules (see 6.3).

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document is proposed and coordinated by the National Technical Committee for Mould Standardization (SAC/TC 33).

1 Scope

This document specifies the raw materials, forging process and finished product requirements for die forging hammers and large mechanical forging presses, and describes the corresponding tests Methods, inspection rules, marking, logo, packaging, transportation and storage are specified.

This document applies to the manufacture of alloy steel forging modules for die forging hammers and large mechanical forging presses (including screw presses).

Note: In order to avoid confusion, "modules for die forging hammers and large mechanical forging presses" in this document are referred to as "modules".

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies. in this document.

GB/T 223 Iron, steel and alloys (all parts)

GB/T 226 Acid etching test method for macrostructure and defects of steel

GB/T 231.1 Brinell hardness test for metallic materials Part 1: Test method

GB/T 1299-2014 Tool Steel

GB/T 1979 Structural steel macrostructure defect rating chart

GB/T 4336 Determination of multi-element content of carbon steel and medium and low alloy steel Spark discharge atomic emission spectrometry (conventional method)

GB/T 6402-2008 Ultrasonic testing method for steel forgings

GB/T 8541 Forging Terminology

GB/T 10561-2023 Determination of non-metallic inclusions in steel - Standard for determination of non-metallic inclusions in steel - Microscopic examination method using a rating chart

GB/T 11261 Iron and steel - Determination of oxygen content - Pulse heating inert gas fusion - infrared absorption method

GB/T 17505 General technical requirements for delivery of steel and steel products

GB/T 20066 Sampling and sample preparation methods for determination of chemical composition of steel and iron

GB/T 20123 Determination of total carbon and sulfur content of steel - Infrared absorption method after combustion in a high-frequency induction furnace (conventional method)

GB/T 20124 Determination of nitrogen content in steel - Inert gas fusion thermal conductivity method (conventional method)

JB/T 6052 General technical conditions for heating of steel free forgings

JB/T 8466 Penetrant testing of forged steel parts

3 Terms and definitions

The terms and definitions defined in GB/T 8541 apply to this document.

4 Technical requirements