GB/T 230 is the Chinese national recommended standard series used for Rockwell hardness testing of metallic materials. It is commonly referenced in production QA/QC, incoming inspection, heat treatment verification, and materials qualification where hardness is used as a quick indicator of mechanical performance and process consistency.
Because GB/T 230 is published as multiple parts (test method plus machine/indenter and reference-block requirements), correct equipment selection and compliance depend on which part and edition your customer or drawing cites. If you need help aligning your procedure or equipment to a specific citation, talk with our team.
GB/T 230 — Metallic materials Rockwell hardness test (series)
GB/T 230 is a multi-part standard family covering Rockwell and superficial Rockwell hardness testing on metallic materials. In practice, it is used both to run hardness measurements and to control the metrology chain (verification/calibration of testers, indenters, and reference blocks) that supports traceable results.
In many purchasing and audit situations, a cited “GB/T 230” requirement is effectively pointing to: (1) the Rockwell test method, and (2) the verification/calibration rules that keep the hardness tester within allowable performance.
Quick Definition
What it is: A Chinese GB/T multi-part standard for Rockwell hardness testing of metallic materials, including the test method and the supporting verification/calibration framework.
What it measures: Indentation hardness reported in Rockwell hardness scales (e.g., regular Rockwell and superficial Rockwell scales), based on indentation depth under specified forces and indenters.
Typical output: A reported Rockwell hardness value (scale-dependent) supported by documented equipment verification and suitable reference standards when required.
What This Standard Covers
GB/T 230 is organized as a series. Commonly cited parts include:
- GB/T 230.1: The Rockwell hardness test method for metallic materials (how to perform the test and report results).
- GB/T 230.2: Verification and calibration of Rockwell hardness testing machines and indenters (how to evaluate machine performance and key metrology elements).
- GB/T 230.3: Calibration of Rockwell reference blocks (how standard/reference hardness blocks are calibrated for use in indirect verification and ongoing control).
If a contract or drawing only states “GB/T 230” without a part number, it is usually important to clarify whether the requirement is only about running the method, or also about demonstrating verification/calibration status for the tester and reference blocks.
Why This Standard Matters in Testing
Rockwell hardness is widely used because it is fast, relatively simple to run on production samples, and is often used as an acceptance criterion for steels and other alloys after processes such as heat treatment, forming, or surface treatments.
GB/T 230 matters because it ties the hardness number to a defined scale, force/indenter combination, and a verification/calibration approach that helps reduce lab-to-lab variation and supports customer or audit requirements.
Common Materials, Product Types, or Applications Covered
GB/T 230 is commonly applied to metallic materials and metal products where Rockwell hardness is a specified control characteristic, such as:
- Heat-treated steel components (gears, shafts, fasteners, bearings, tooling components)
- General metal stock and mill products used for fabrication
- Metal parts requiring rapid hardness checks during production or incoming inspection
- Thinner metallic products where superficial Rockwell scales may be used (when specified by the cited part/edition and product requirement)
Applicability depends on the specific Rockwell scale(s) specified, sample geometry, surface condition requirements, and the part/edition cited.
Common Test or Verification Workflow
Workflows often reference multiple parts of the GB/T 230 series rather than only the test method.
Common workflows: (1) confirm tester suitability for the required Rockwell scale(s); (2) verify or calibrate the hardness tester and indenters as required; (3) run hardness measurements on representative areas; (4) document results with the correct scale designation and any required verification records.
Practical caution: Rockwell results are highly sensitive to using the correct scale and indenter type, controlling the test cycle and forces, and maintaining a verification routine using appropriate reference blocks consistent with the cited part and edition.
Equipment Commonly Used for This Standard
Equipment needs depend on whether you are only running production checks (method) or also supporting formal verification/calibration requirements.
Common equipment: Rockwell hardness testers (regular and/or superficial), appropriate indenters (diamond and/or ball types as required by the specified scale), anvils/supports suited to the specimen geometry, and certified reference blocks used for indirect verification and routine performance monitoring.
Calibration and control tools: When GB/T 230.2 and GB/T 230.3 are invoked, planning typically includes access to suitable reference blocks and a defined schedule for verification and calibration actions that match the cited requirements.
If you are selecting a Rockwell tester configuration (manual vs. digital, regular vs. superficial capability, indenters, anvils, and reference blocks) for a specific GB/T 230 citation, you can request a detailed quote for an equipment package aligned to your required scales and documentation needs.
How to Read This Designation or Revision
GB/T: Indicates a recommended national standard of the People’s Republic of China.
230: The standard series number for Rockwell hardness testing of metallic materials.
Part numbering: The decimal suffix (for example, “.1”, “.2”, “.3”) identifies the part of the series (method, machine/indenter verification, reference-block calibration).
Year: The year suffix (for example, “-2018” or “-2022”) identifies the edition; technical requirements and verification details can change by revision, so purchase specifications and compliance documentation should match the exact cited edition.
Related Standards, Methods, or Frameworks
Rockwell hardness is often used alongside other indentation hardness methods (such as Brinell or Vickers) depending on material hardness range, thickness, and customer requirements. When multiple hardness methods appear in a purchase order or drawing package, ensure the specified method and scale are matched to the correct instrument and verification approach.
Get help aligning your Rockwell setup to the cited GB/T 230 requirement
If your documentation cites “GB/T 230” without a part number, or you need to match a specific edition and Rockwell scale set to your samples and compliance requirements, contact our team for practical guidance on equipment configuration and verification planning.
