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 Strip Steel
The specification of the hardened and tempered steel strips
Material SK-2 SK-4 SK-5 SK-7 S50C
Thickness 0.10~1.50mm
Width 5~100mm
Product Application of the hardened and tempered steel strips
(Raw Material) SK-2 SK-4 SK-5 SK-7 S50C
(Application)
Band saw ★ ★ ★    
Circular saw   ★ ★    
Hacksaw   ★ ★ ★  
Cutter blades ★ ★ ★
Measuring Tape   ★ ★ ★
Special spring ★ ★
Textile parts ★

 ★
Auto parts     ★ ★  
Chemical composition
JIS
Mark		 Chemical Composition ％
C Si Mn P S Cu Ni Cr
SK-2 1.15~1.25 0.15~0.35 0.10~0.50 ≦0.030 ≦0.030 ≦0.25 ≦0.25 ≦0.30
SK-4 0.90~1.00 0.15~0.35 0.10~0.50 ≦0.030 ≦0.030 ≦0.25 ≦0.25 ≦0.30
SK-5 0.80~0.90 0.15~0.35 0.10~0.50 ≦0.030 ≦0.030 ≦0.25 ≦0.25 ≦0.30
SK-7 0.65~0.75 0.15~0.35 0.60~0.90 ≦0.030 ≦0.035 ≦0.30 ≦0.20 ≦0.20
S50C 0.47~0.53 0.15~0.35 0.60~0.90 ≦0.030 ≦0.035 ≦0.30 ≦0.20 ≦0.20
Tolerance on thickness Unit:mm
Thickness Thickness tolerances

Above( > )

Less than( ≦ )

 A B C
0.10Above 0.15Less than ±0.005 ±0.006 ±0.007
0.15Above 0.25Less than ±0.008 ±0.01 ±0.015
0.25Above 0.40Less than ±0.02 ±0.015 ±0.010
0.40Above 0.60Less than ±0.015 ±0.020 ±0.025
0.60Above 0.90Less than ±0.020 ±0.025 ±0.030
0.90Above 1.20Less than
 ±0.025 ±0.030 ±0.040
1.20Above 1.50Less than
 ±0.030 ±0.040 ±0.050
Note: There are 3 rank of A, B, C for the thickness tolerance limit of the hardened and tempered steel strips, it can be manufacture in accordance with the customer’s or Order-Metal’s request.
Tolerance on width Unit:mm
Thickness Thickness tolerances

Above( > )

Less than( ≦ )

 A B C
  0.60Less than 0~-0.05 0~-0.1 0~-0.2
0.60Above 1.00Less than 0~-0.05 0~-0.1 0~-0.2
1.00Above 1.20Less than 0~-0.05 0~-0.1 0~-0.2
1.20Above 1.60Less than 0~-0.05 0~-0.1 0~-0.2
Note: There are 3 rank of A, B, C for the width tolerance limit of the hardened and tempered steel strips, it can be manufacture in accordance with the customer’s or Order-Metal’s request.
Hardness conversion table
Vickers Rockwell Shore
HV HRC HS
940 68 97
900 67 95
865 66 92
832 65 91
800 64 88
772 63 87
746 62 85
720 61 83
697 60 81
674 59 80
653 58 78
633 57 76
613 56 75
595 55 74
577 54 72
560 53 71
544 52 69
528 51 68
513 50 67
498 49 66
484 48 64
471 47 63
458 46 62
446 45 60
434 44 58
423 43 57
412 42 56
402 41 55
392 40 54
382 39 53
Vickers Rockwell Shore
HV HRC HS
372 38 52
363 37 51
354 36 50
345 35 49
336 34 48
327 33 47
318 32 46
310 31 45
302 30 44
294 29 43
286 28 42
279 27 41
272 26 40
266 25 39
260 24 38
254 23 37
248 22 36
243 21 35
238 20 34
230 (18) 33
222 (16) 32
213 (14) 31
210 (13.4) 30
200 (11.0) 29
190 (8.5) 28
180 (6.0) 26
170 (3.0) 25
160 (0.0) 24
150   22
140   21