Carbon Steel Pipe Hardness

The hardness of carbon steel pipe commonly used Brinell, Rockwell, Vickers hardness of three kinds of indicators to measure.

Brinell hardness
In the steel standard, it is the most widely Brinell hardness, often expressed in the indentation hardness of the material in diameter, both intuitive and convenient. However, for a hard steel or steel thin NA.

Rockwell hardness
Rockwell hardness test tube with Brinell hardness test, as are the indentation test methods. The difference is that it is a measure of the indentation depth. Steel Rockwell hardness test is a very wide application, wherein after the Brinell hardness HB HRC use in steel standard. Rockwell applicable to the determination by the extremely soft to extremely hard metal materials, which make up not Brinell method, compared with Brinell method is simple and can be read directly from the dial hardness machine hardness value. However, because of its small indentation, the Brinell hardness values better method is accurate.

Vickers hardness

The pipe is also a Vickers hardness test indentation test method for the determination of a thin metal material and a surface layer hardness. It has a Brinell, Rockwell main advantages law, and to overcome their basic shortcomings, but not as convenient method Rockwell, Vickers method is rarely used in the steel standard.

Hardness value table

Brinell hardness (HB)	Rockwell hardness (HRC)	Vickers hardness (HV)
415	44.5	440
401	43.1	425
388	41.8	410
375	40.4	396
363	39.1	383
352	37.9	272
341	36.6	360
331	35.5	350
321	34.3	339
311	33.1	328
302	32.1	319
293	30.9	309
285	29.9	301
277	28.8	292
269	27.6	284
262	26.6	276
255	25.4	269
248	24.2	261
241	22.8	253
235	21.7	247
229	20.5	241
223	-	234
217	-	228
212	-	222
207	-	218
201	-	212
197	-	207
192	-	202
187	-	296
183	-	192
179	-	188
174	-	183
170	-	178
167	-	175
163	-	171
156	-	163
149	-	156
143	-	150
-	68.0	940
-	67.5	920
-	67.0	900
767	66.4	880
757	65.9	860
745	65.3	840
733	64.7	920
722	64.0	900
710	63.3	780
698	62.5	760
684	61.8	740
682	61.7	737
670	61.0	720
656	60.1	700
653	60.0	697
647	59.7	690
638	59.2	680
630	58.8	670
627	58.7	667
620	58.3	660
601	57.3	640
578	56.0	615
-	55.6	607
555	54.7	591
-	54.0	579
534	53.5	569
-	52.5	553
514	52.1	547
-	51.6	539
-	51.1	530
495	51.0	528
-	50.3	516
477	49.6	508
-	48.8	495
461	48.5	491
-	47.2	474
444	47.1	472
429	45.7	455