GB/T 6803-2023Test method for drop-weight test to determine nil-ductility transition temperature of ferritic steels (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 6803-2008 "Drop weight test method for non-plastic transition temperature of ferritic steels" and is consistent with GB/T 6803-2008 In comparison, in addition to structural adjustments and editorial changes, the main technical changes are as follows:

---The test principle has been changed (see Chapter 4, Chapter 3 of the 2008 edition);

---Changed the yield strength range and impact energy range of the drop weight test (see Table 3, Table 3 of the 2008 version);

---Added requirements for testing machine calibration (see 6.7).

1 Scope

This document specifies the principles, specimens, test equipment, test requirements, and test procedures of the non-plastic transition temperature drop weight test method for ferritic steels. Procedure, test result evaluation and test report.

This document is suitable for determining the non-plastic transformation of ferritic steel products (including plates, profiles, cast steel and forged steel) with a thickness of not less than 12mm. Change temperature.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 984 surfacing electrode

GB/T 2975 Sampling location and sample preparation for mechanical property testing of steel and steel products

JJF1445 Calibration specification for drop weight impact testing machine

3 Terms and definitions

The following terms and definitions apply to this document.

4 Principles

Each of a set of specimens of a given ferritic steel material is subjected to a single drop weight impact load at a selected temperature.

Make the sample produce a fixed deflection, and measure the maximum temperature when the sample breaks, that is, the no-plastic transition (NDT) temperature.

5 Samples