Scope This Japanese Industrial Standard specifies the cold rolled special steel strip(hereafter referred to as "steel strip"). This Standard also applies to cut pieces of steel strip.
Normative references The standards given in attached table1 contain provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standards (including amendments) shall be applied.
Type symbols The steel strip shall be classified into 38 kinds and the type symbols shall be as given in table1.
Manufacturing method For the manufacturing method of steel strip, carry out cold rolling after hot rolling and allow it to be as cold rolled, or annealed after cold rolling.
Table1 Type Symbols
| Division |
Type symbol |
Division |
Type symbol |
Division |
Type symbol |
| Carbon steel |
S30CM |
Alloy tool steel |
SKS2M |
Manganese steel |
SMn438M |
| S35CM |
SKS5M |
|
SMn443M |
| S40CM |
SKS51M |
|
|
| S45CM |
SKS7M |
|
|
| S50CM |
SKS81M |
|
|
| S55CM |
SKS95M |
|
|
| S60CM |
Chrome steel |
SCr420M |
|
|
| S65CM |
SCr435M |
|
|
| S70CM |
SCr440M |
|
|
| S75CM |
Nickel chrome steel |
SNC415M |
|
|
| Carbon tool steel |
SK120M(SK2M) |
SNC631M |
|
|
| SNC836M |
|
|
| SK105M(SK3M) |
Nickel chrome molybdenum steel |
SNCM220M |
|
|
| SNCM415M |
|
|
| SK95M(SK4M) |
Chrome molybdenum steel |
SCM415M |
|
|
| SCM430M |
|
|
| SK85M(SK5M) |
SCM435M |
|
|
| SCM440M |
|
|
| SK75M(SK6M) |
Spring steel |
SUP6M |
|
|
| SUP9M |
|
|
| SK65M(SK7M) |
SUP10M |
|
|
Remarks: The parentheses indicate the type symbols specified in the former edition of this JIS.
Information: SK75 and SK65M are scheduled to be eliminated in reviewing after five years.
Below is a list of some SAE-AISI designations for Steel (the xx in the last two digits indicate the carbon content in hundredths of a percent)
| Carbon Steels |
Illustration of effect of Carbon content on Steel Hardness |
| 10xx |
Plain Carbon |
| 11xx |
Resulfurized |
| 12xx |
Resulfurized and rephosphorized |
| Manganese steels |
|
| 13xx |
Mn 1.75 |
| Nickel steels |
|
| 23xx |
Ni 3.5 |
| 25xx |
Ni 5.0 |
| Nickel Chromium Steels |
|
| 31xx |
Ni 1.25 Cr 0.65-0.80 |
| 32xx |
Ni 1.75 Cr 1.07 |
| 33xx |
Ni 3.50 Cr 1.50-1.57 |
| 34xx |
Ni 3.00 Cr 0.77 |
| Chromium Molybdenum steels |
|
| 41xx |
Cr 0.50-0.95 Mo 0.12-0.30 |
| Nickel Chromium Molybdenum steels |
|
| 43xx |
Ni 1.82 Cr 0.50-0.80 Mo 0.25 |
| 47xx |
Ni 1.05 Cr 0.45 Mo 0.20 - 0.35 |
| 86xx |
Ni 0.55 Cr 0.50 Mo 0.20 |
| Nickel Molybdenum steels |
|
| 46xx |
Ni 0.85-1.82 Mo 0.20 |
| 48xx |
Ni 3.50 Mo 0.25 |
| Chromium steels |
|
| 50xx |
Cr 0.27- 0.65 |
| 51xx |
Cr 0.80 - 1.05 |
| 