Standard No.:	GB/T 230.1-2018
Chinese Name:	金属材料　洛氏硬度试验　第1部分：试验方法
English Name:	Metallic materials—Rockwell hardness test—Part 1:Test method
Professional Classification:	H22 Metal mechanical property test method
ICS Classification:	77.040.10 Mechanical testing of metals
Issued by:
Issued on:	2018-05-14
Implemented on:	2018-12-01
Status:	VALID
Replace:	GB/T230.1-2009 Metallic materials - Rockwell hardness test - Part 1: Test method(scales A、B、C、D、E、F、G、H、K、N、T)
Language:	English
File Format:	PDF
Word Count:	16000 words
Price(USD):	480 (USD)
Delivery:	via email in 1-5 business day

1 Scope

This part of GB/T 230 specifies the method for Rockwell regular and Rockwell superficial hardness tests for metallic materials with scales of A, B, C, D, E, F, G, H, K, 15N, 30N, 45N, 15T, 30T, and 45T.

It is applicable to stationary and portable hardness testing machines. For specific materials or products, other specific standards apply (for instance, GB/T 3849.1[1], GB/T 9097[2]).

Note: Attention is drawn to the fact that the use of tungsten carbide composite for ball indenters is considered to be the standard type of Rockwell indenter ball. Steel indenter balls are allowed to continue to be used only when complying with Annex A.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 230.2-2012 Metallic materials - Rockwell hardness test - Part 2: Verification and calibration of testing machines (Scales A, B, C, D, E, F, G, H, K, N, T) (GB/T 230.2-2012, ISO 6508-2: 2005, MOD)
GB/T 230.3 Metallic materials - Rockwell hardness test - Part 3: Calibration of reference blocks (Scales A, B, C, D, E, F, G, H, K, N, T) (GB/T 230.3-2012, ISO 6508-3: 2005, MOD)
JJG 112 Metallic Rockwell hardness testers (scales A, B, C, D, E, F, G, H, K, N, T)
JJF 1059.1 Evaluation and expression of uncertainty in measurement

3 Principle

An indenter of specified size, shape, and material is forced into the surface of a test specimen under two force levels using the specific conditions defined in Clause 7. The specified preliminary force is applied and the initial indentation depth is measured, followed by the application and removal of a specified additional force, returning to the preliminary force. The final indentation depth is then measured and the Rockwell hardness value is derived from the difference, h, in the final and initial indentation depths and the two constants N and S (see Figure 1, Table 1, and Table 2) as shown in Formula