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|
ALLOY STEELS |
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| NOTES PERTAINING TO ALLOY STEELS | ||||||||
|
Most grades are
normally manufactured by the basic open hearth or basic oxygen
process but may be manufactured by the basic electric furnace
process with adjustments in phosphorous and sulfur. In the tables
on the following pages, some grades, with a prefix letter E, are
normally made only by the basic electric furnace process.
The phosphorus and sulfur limitations for each process are as follows: |
||||||||
| Process |
P
|
S
|
||||||
|
Max(%)
|
||||||||
| Basic Electric Furnace |
0.025
|
0.025
|
||||||
| Basic Open Hearth |
0.035
|
0.04
|
||||||
| Acid Electric Furnace |
0.05
|
0.05
|
||||||
| Acid Open Hearth |
0.05
|
0.05
|
||||||
| Small quantities of certain elements are present in alloy steels which are not specified or required. These elements are considered as incidental and may be present to the following maximum amounts: | ||||||||
| Element | Max (% ) | |||||||
| Cooper | 0.35 | |||||||
| Nickel | 0.25 | |||||||
| Chromium | 0.2 | |||||||
| Molybdenum | 0.06 | |||||||
|
Standard alloy steels can be produced with a lead range of 0.15/0.35
percent. Such steels are identified by inserting the letter "L"
between the second and third numerals of the AISI number, for example,
41L40. A heat analysis for lead is not determinable, since lead
is added to the ladle stream as the steel is being poured. boron steels contain 0.0005/0.003 percent Boron. |
||||||||
| CHEMICAL COMPOSITION LIMITS (%) | ||||||||
| AISI (SAE) |
C
|
Mn
|
P
|
S
|
Si
|
Ni
|
Cr
|
Mo
|
|
(Max)
|
(Max)
|
|||||||
| 1330 |
0.28-0.33
|
1.60-1.90
|
0.035
|
0.04
|
0.15-0.35
|
--
|
--
|
--
|
| 1335 |
0.33-0.38
|
1.60-1.90
|
0.035
|
0.04
|
0.15-0.35
|
--
|
--
|
--
|
| 1340 |
0.38-0.43
|
1.60-1.90
|
0.035
|
0.04
|
0.15-0.35
|
--
|
--
|
--
|
| 1345 |
0.43-0.48
|
1.60-1.90
|
0.035
|
0.04
|
0.15-0.35
|
--
|
--
|
--
|
| 3312 |
0.10-0.15
|
0.45-0.60
|
0.035
|
0.025
|
0.15-0.35
|
3.25-3.75
|
1.40-1.75
|
--
|
| 4012 |
0.09-0.14
|
0.75-1.00
|
0.035
|
0.04
|
0.15-0.35
|
--
|
--
|
0.15-0.25
|
| 4023 |
0.09-0.25
|
0.70-0.90
|
0.035
|
0.04
|
0.15-0.35
|
--
|
--
|
0.15-0.25
|
| 4024 |
0.20-0.25
|
0.70-0.90
|
0.035
|
.035-.050
|
0.15-0.35
|
--
|
--
|
0.20-0.30
|
| 4027 |
0.25-0.30
|
0.70-0.90
|
0.035
|
0.04
|
0.15-0.35
|
--
|
--
|
0.20-0.30
|
| 4028 |
0.25-0.30
|
0.70-0.90
|
0.035
|
.035-.050
|
0.15-0.35
|
--
|
--
|
0.20-0.30
|
| 4032 |
0.30-0.35
|
0.70-0.90
|
0.035
|
0.04
|
0.15-0.35
|
--
|
--
|
0.20-0.30
|
| 4037 |
0.35-0.40
|
0.70-0.90
|
0.035
|
0.04
|
0.15-0.35
|
--
|
--
|
0.20-0.30
|
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