Information on the most widely used ASTM standards within the materials testing industry
Model: HRSS-150A
Dolphin nose indenter Dual Rockwell Hardness Tester is a large-platform Rockwell hardness tester that uses the Rockwell (ROCKWELL) measurement principle. It is used for hardness testing of materials such as carbon steel, alloy steel, cast iron, non-ferrous metals, and engineering plastics. It employs advanced international closed-loop sensor control technology to achieve automatic control and the hardness testing process. The loading system uses a high-precision force sensor and a central controller to form a closed-loop circuit, realizing microsecond-level tracking and control of the force application process. It is widely used in metrology, mechanical manufacturing, metallurgy, chemical industry, building materials, and other fields for testing, scientific research, and production.
General Introduction
Model HRSS-150A: Rockwell and superficial Rockwell hardness incorporated tester
Dolphin nose indenter Dual Rockwell Hardness Tester is a large-platform Rockwell hardness tester that uses the Rockwell (ROCKWELL) measurement principle. It is used for hardness testing of materials such as carbon steel, alloy steel, cast iron, non-ferrous metals, and engineering plastics. It employs advanced international closed-loop sensor control technology to achieve automatic control and the hardness testing process. The loading system uses a high-precision force sensor and a central controller to form a closed-loop circuit, realizing microsecond-level tracking and control of the force application process. It is widely used in metrology, mechanical manufacturing, metallurgy, chemical industry, building materials, and other fields for testing, scientific research, and production.
Key Features
1. Specially designed dolphin nose indenter, this head horizontally protruding ring can be measured, such as general hardness tubular parts can not be measured, the minimum inner diameter of 25mm test
2. The touch-screen interface, easy to operate, in any language version
3. There is no need to install weights or installation.
4. Electric load and closed-loop control
5. Test force automatic correction, improve the accuracy of a force of magnitude
6. All Rockwell scale, high, medium and low hardness value is automatically corrected three sections
7. Set up a password-protected setup parameters; keeping more samples and test information
8. U disk save measurement data to EXCEL format for easy editing and processing
9. modular design, easy maintenance.
The indenter moves down into position on the part surface
A minor load is applied and a zero reference position is established
The major load is applied for a specified time period (dwell time) beyond zero
The major load is released leaving the minor load applied.

The resulting Rockwell number represents the difference in depth from the zero reference position as a result of the application of the major load.
ASTM E18 “Standard Test Methods for Rockwell Hardness of Metallic Materials”
ISO 6508 “Metallic materials — Rockwell hardness test”
ASTM D785 “Standard Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materials”
● Measuring the Rockwell hardness of soft metal materials such as ferrous and non-ferrous metals;
● Measuring the Rockwell hardness of high-hardness alloy materials such as cemented carbide;
● Measuring the Rockwell hardness of heat-treated materials such as quenched and tempered metals;
● Measuring the Rockwell hardness of certain non-metallic materials such as plastics and bakelite.
Main Technical Specification
| Model | HRSS-150A | |
| Methods | Rockwell | Superficial Rockwell |
| Hardness scales | HRA,HRB,HRC,HRD,HRE,HRF,HRG,HRH, HRK,HRL,HRM,HRR,HRP,HRS,HRV | 15N,30N,45N,15T,30T,45T,15W,30W, 45W,15X,30X,45X,15Y,30Y,45Y |
| Initial testing force | 98.07N (10Kg) | 29.42N (3Kg) |
| Total test force | 588.4N(60Kg), 980.7N(100Kg), 1471N(150Kg) | 147.1N(15Kg), 294.2N(30Kg), 441.3N(45Kg) |
| Measuring range | HRA:20-88,HRB:20-100,HRC:20-70,HRD:40-77, HRE:70-100,HRF:60-100,HRG:30-94,HRH:80-100, HRK:40-100,HRL:100-120,HRM:85-115,HRR:114-125 | HR15N:70-94, HR30N:42-86, HR45N:20-77, HR15T:67-93, HR30T:29-82, HR45T:1-72 |
| Duration time control | 0-99S adjustable | |
| Hardness value Resolution | 0.1 Rockwell hardness unit | |
| Test load accuracy | <0.5% | |
| Touching screen display | Menu selection, hardness value displaying, data statistics, storage, parameter setting etc., | |
| Data storage | USB flash disk; Save in U disk in EXCEL format | |
| Scales exchange | Brinell, Vicker’s Rockwell, Superficial Rockwell etc. | |
| Max. height of specimen | 300mm | |
| Max. width of specimen | 250mm | |
| Dimensions | 720×280×840mm | |
| Weight | 80Kg | |
| Power supply | AC 220V, 50-60HZ | |
| Standard | BSEN 6508, ISO 6508, ASTM E18, GB/T230 | |
Main accessories
| Item | Quantity |
| Frame | 1 set |
| Rockwell diamond indenter | 1 pc |
| Ball indenter with the diameter of 1.5875 mm | 1 pc |
| Hardness block (HRC, HRB, HR15N, HR30N, HR30T) | 6 pcs |
| Large, medium, V-type testing bench | 1 set each |
| Fuse 2A | 1 pc |
| Power cable | 1 pc |
| U disk, touch pen | 1 pc |
| Documents (Manual, packing list, certificate) | |
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