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HV≈HB≈HRC hardness comparison table

Attention:     Issuing time:2020-09-16 09:00
HV≈HB≈HRC hardness comparison table
 
 
Hardness refers to the ability of a material to resist local deformation, especially plastic deformation, indentation or scratches. It is a measure of the hardness of the material. The comparison table of Vickers hardness, Brinell hardness, and Rockwell hardness is shared with you. Collect it now!
 
 
Commonly used HV=HB=HRC hardness comparison table
 

Tensile strength

N/mm2

Vickers hardness

HV

Brinell hardness

HB

Rockwell hardness

HRC

255

80

76.0

270

85

80.7

285

90

85.2

305

95

90.2

320

100

95.0

335

105

99.8

350

110

105

370

115

109

380

120

114

400

125

119

415

130

124

430

135

128

450

140

133

465

145

138

480

150

143

490

155

147

510

160

152

530

165

156

545

170

162

560

175

166

575

180

171

595

185

176

610

190

181

625

195

185

640

200

190

660

205

195

675

210

199

690

215

204

705

220

209

720

225

214

740

230

219

755

235

223

770

240

228

20.3

785

245

233

21.3

800

250

238

22.2

820

255

242

23.1

835

260

247

24.0

850

265

252

24.8

865

270

257

25.6

880

275

261

26.4

900

280

266

27.1

915

285

271

27.8

930

290

276

28.5

950

295

280

29.2

965

300

285

29.8

995

310

295

31.0

1030

320

304

32.2

1060

330

314

33.3

1095

340

323

34.4

1125

350

333

35.5

1115

360

342

36.6

1190

370

352

37.7

1220

380

361

38.8

1255

390

371

39.8

1290

400

380

40.8

1320

410

390

41.8

1350

420

399

42.7

1385

430

409

43.6

1420

440

418

44.5

1455

450

428

45.3

1485

460

437

46.1

1520

470

447

46.9

1555

480

(456)

47.7

1595

490

(466)

48.4

1630

500

(475)

49.1

1665

510

(485)

49.8

1700

520

(494)

50.5

1740

530

(504)

51.1

1775

540

(513)

51.7

1810

550

(523)

52.3

1845

560

(532)

53.0

1880

570

(542)

53.6

1920

580

(551)

54.1

1955

590

(561)

54.7

1995

600

(570)

55.2

2030

610

(580)

55.7

2070

620

(589)

56.3

2105

630

(599)

56.8

2145

640

(608)

57.3

2180

650

(618)

57.8

 

660

 

58.3

 

670

 

58.8

 

680

 

59.2

 

690

 

59.7

 

700

 

60.1

 

720

 

61.0

 

740

 

61.8

 

760

 

62.5

 

780

 

63.3

 

800

 

64.0

 

820

 

64.7

 

840

 

65.3

 

860

 

65.9

 

880

 

66.4

 

900

 

67.0

 

920

 

67.5

 

940

 

68.0

 
The data in this table comes from the German standard DIN50150
 
 
 
Hardness of metal materials
hardness
Refers to the ability of a material to resist local deformation, especially plastic deformation, indentation or scratches. It is a measure of the hardness of the material.
 
According to different test methods, hardness is divided into three types.
 
①Scratch hardness. It is mainly used to compare the softness and hardness of different minerals. The method is to choose a rod with one end hard and one soft end, and the material to be tested is scratched along the rod, and the hardness of the material to be tested is determined according to the position of the scratch. Qualitatively speaking, hard objects have long scratches and soft objects have short scratches.
 
②Press-in hardness. Mainly used for metal materials. The method is to press the specified indenter into the tested material with a certain load, and compare the hardness of the tested material with the size of the local plastic deformation on the surface of the material. Due to the difference of indenter, load and load duration, there are many kinds of indentation hardness, mainly Brinell hardness, Rockwell hardness, Vickers hardness and micro hardness.
 
③Rebound hardness. It is mainly used for metal materials. The method is to make a special hammer fall freely from a certain height to impact the sample of the material to be tested, and how much strain energy the sample stores (and then releases) during the impact process (through the return of the hammer) Jump height measurement) to determine the hardness of the material.
 
The most common Brinell hardness, Rockwell hardness and Vickers hardness of metal materials belong to the indentation hardness. The hardness value indicates the ability of the surface of the material to resist the plastic deformation caused by the intrusion of another object; the rebound method (Shore, Li The hardness is measured, and the hardness value represents the size of the elastic deformation function of the metal.
Brinell Hardness
 
Use a quenched steel ball or cemented carbide ball of diameter D as the indenter, press it into the surface of the test piece with the corresponding test force F, after the specified holding time, remove the test force, and obtain an indentation of diameter d. Divide the test force by the surface area of ​​the indentation, the value obtained is the Brinell hardness value, and the symbol is represented by HBS or HBW.

 
 
 
The difference between HBS and HBW is the indenter. HBS means that the indenter is a hardened steel ball, which is used to determine materials with a Brinell hardness value below 450, such as mild steel, gray cast iron and non-ferrous metals. HBW indicates that the indenter is a cemented carbide and is used to determine materials with a Brinell hardness value below 650.
 
 
The same test block, when other test conditions are completely the same, the two test results are different, the HBW value is often greater than the HBS value, and there is no quantitative rule to follow.
 
After 2003, my country has adopted international standards equivalently, abolished the steel ball indenter, and all adopted cemented carbide ball heads. Therefore, HBS is discontinued, and HBW is used to represent the Brinell hardness symbol. In many cases, Brinell hardness is only expressed by HB, which means HBW. However, HBS is still seen in literature papers.
 
The Brinell hardness measurement method is suitable for cast iron, non-ferrous alloys, various annealed and quenched and tempered steels. It is not suitable to measure samples or workpieces that are too hard, too small, too thin and are not allowed to have large indentations on the surface.

 
Rockwell Hardness
Use diamond cones with a cone angle of 120° or Ø1.588mm and Ø3.176mm quenched steel balls as the indenter and load. The initial load is 10kgf and the total load of 60, 100 or 150kgf (ie initial load plus main load) The specimens are pressed in successively, and after the total load is applied, the hardness is expressed by the difference between the indentation depth when the main load is removed and the main load is retained and the indentation depth under the initial load.
 

 
The Rockwell hardness test uses three test forces and three indenters. There are 9 combinations of them, corresponding to 9 scales of Rockwell hardness. The application of these 9 rulers covers almost all commonly used metal materials. There are three commonly used HRA, HRB and HRC, of ​​which HRC is the most widely used.
 
Commonly used Rockwell hardness test specification table

Hardness
Indenter type
Total test force F/N (kgf)
Hardness range
Application examples
HRA
120°diamond cone
588.4(60)
20~88
Cemented carbide, carbide, shallow surface hardening steel, etc.
HRB
Ø1.588mm hardened steel ball
980.7(100)
20~100
Annealed, normalized steel, aluminum alloy, copper alloy, cast iron
HRC
120°diamond cone
1471(150)
20~70
Hardened steel, quenched and tempered steel, deep surface hardened steel
 
 
The applicable range of HRC scale is 20~70HRC. When the hardness value is less than 20HRC, because the conical part of the indenter is pressed too much, the sensitivity is reduced, then the HRB scale should be used; when the hardness of the sample is greater than 67HRC, the pressure on the tip of the indenter is too large and the diamond is easily damaged. The life of the indenter will be greatly shortened, so HRA scale should generally be used instead.
 
 
Rockwell hardness test is simple, fast and small indentation. It can test the surface of finished products and harder and thinner workpieces. Due to the small indentation, for materials with uneven structure and hardness, the hardness value fluctuates greatly, and the accuracy is not as high as the Brinell hardness. Rockwell hardness is used to determine the hardness of steel, non-ferrous metals, cemented carbide, etc.

 
Vickers Hardness
The principle of Vickers hardness measurement is similar to that of Brinell hardness. Adopt a diamond square pyramid indenter with an angle of 136° relative to the surface, press it into the surface of the material with the specified test force F, and then remove the test force after maintaining it for a specified time. The hardness is expressed by the average pressure on the unit surface area of ​​the square pyramid indentation. Value, the symbol is HV.
 
 
Vickers hardness measurement range is large, and it can measure materials with hardness in the range of 10~1000HV, with small indentation. It is generally used to measure thinner materials and surface hardening layers such as carburizing and nitriding.
 
Leeb Hardness
Use a certain quality of impact body equipped with tungsten carbide ball head to impact the surface of the test piece under a certain force, and then rebound. Due to the different hardness of the material, the rebound speed after impact is also different. A permanent magnetic material is installed on the impact device. When the impact body moves up and down, its peripheral coil induces an electromagnetic signal proportional to the speed, which is converted into a Leeb hardness value through an electronic circuit. The symbol is marked HL.
 
The Leeb hardness tester does not require a workbench. Its hardness sensor is as small as a pen and can be directly operated by hand. It can easily detect large and heavy workpieces or workpieces with complex geometric dimensions.
 
Another advantage of the Leeb hardness is that the damage to the surface of the product is very light, and sometimes it can be used as a non-destructive test; it is unique for hardness testing in all directions, narrow spaces and special parts.


 

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