Corrosion





This steel like any other steel when distorted by cold

working is more sensitive to corrosion and will rust. Rough cut

surfaces will rust. Surfaces finished with a fine cut are less

liable to rust. Ground and polished surfaces are practically immune

to rust.



When chromium content is increased to 16 to 18 per cent and silicon

is added, from 2 to 4 per cent, this steel becomes rust proof in

its raw state, as soon as the outside surface is removed. It does

not need to be heat-treated in any way. These compositions are

both patented.



S. A. E. STANDARD STEELS



The following steel specifications are considered standard by the

Society of Automotive Engineers and represents automobile practice in

this country. These tables give the S. A. E. number, the composition

of the steel and the heat treatment. These are referred to by

letter--the heat treatments being given in detail on pages 134

to 137 in Chap. 8. It should be noted that the percentage of the

different ingredients desired is the mean, or halfway between the

minimum and maximum.



TABLE 4.--CARBON STEELS

------------------------------------------------------------------------------

S. A. E. Carbon Manganese

Specification(minimum and (minimum and Phosphorus Sulphur Heat

no. maximum) maximum) (maximum) (maximum) treatment

-------------------------------------------------------------------------

1,010 0.05 to 0.15 0.30 to 0.60 0.045 0.05 Quench at 1,500

1,020 0.15 to 0.25 0.30 to 0.60 0.045 0.05 A or B

1,025 0.20 to 0.30 0.50 to 0.80 0.045 0.05 H



1,035 0.30 to 0.40 0.50 to 0.80 0.045 0.05 H, D or E

1,045 0.40 to 0.50 0.50 to 0.80 0.045 0.05 H, D or E

1,095 0.90 to 1.05 0.25 to 0.50 0.040 0.05 F

------------------------------------------------------------------------------



TABLE 5.--SCREW STOCK

---------------------------------------------------------------------------

S. A. E. Carbon Manganese Phosphorus Sulphur

Specification no. (maximum)

-----------------------------------------------------------------------

1,114 0.08 to 0.20 0.30 to 0.80 0.12 0.06 to 0.12

---------------------------------------------------------------------------



TABLE 6.--NICKEL STEELS

-----------------------------------------------------------------------------

S. A. E. Phosphorus

Specification (maximum)

no. ---- \ /

Carbon Manganese Sulphur Nickel Heat

(minimum and(minimum and (maximum)(minimum andtreatment

maximum) maximum) maximum)

-----------------------------------------------------------------------

2,315 0.10 to 0.200.50 to 0.80 0.04 0.045 3.25 to 3.75G, H or K

2,320 0.15 to 0.250.50 to 0.80 0.04 0.045 3.25 to 3.75G, H or K

2,330 0.25 to 0.350.50 to 0.80 0.04 0.045 3.25 to 3.75 H or K



2,335 0.30 to 0.400.50 to 0.80 0.04 0.045 3.25 to 3.75 H or K

2,340 0.35 to 0.450.50 to 0.80 0.04 0.045 3.25 to 3.75 H or K

2,345 0.40 to 0.500.50 to 0.80 0.04 0.045 3.25 to 3.75 H or K

-----------------------------------------------------------------------------



TABLE 7.--NICKEL-CHROMIUM STEELS

-------------------------------------------------------------------------------

S. A. E. Phosphorus Sulphur

Specification (maximum)(maximum) Heat

no. ------ ------ ---- treatment

Carbon Manganese Nickel Chromium \

(minimum and(minimum and (minimum and(minimum and

maximum) maximum) maximum) maximum)

------------------------------------------------------------------------

3,1200.15 to 0.250.50 to 0.800.040.0451.00 to 1.500.45 to 0.75*G,H or D

3,1250.20 to 0.300.50 to 0.800.040.0451.00 to 1.500.45 to 0.75*H,D or E

3,1300.25 to 0.350.50 to 0.800.040.0451.00 to 1.500.45 to 0.75*H,D or E



3,1350.30 to 0.400.50 to 0 800.040.0451.00 to 1.500.45 to 0 75*H,D or E

3,1400.35 to 0.450.50 to 0.800.040.0451.00 to 1.500.45 to 0.75*H,D or E

3,2200.15 to 0.250.30 to 0.600.040.0401.50 to 2.000.90 to 1.25 G,H or D



3,2300.25 to 0.350.30 to 0.600.040.0401.50 to 2.000.90 to 1.25 H or D

3,2400.35 to 0.450.30 to 0.600.040.0401.50 to 2.000.90 to 1.25 H or D

3,2500.45 to 0.550.30 to 0.600.040.0401.50 to 2.000.90 to 1.25 M or Q



X3,3150.10 to 0.200.45 to 0.750.040.0402.75 to 3.250.60 to 0.95 G

X3,3350.30 to 0.400.45 to 0.750.040.0402.75 to 3.250.60 to 0.95 P or R

X3,3500.45 to 0.550.45 to 0.750.040.0402.75 to 3.250.60 to 0.95 P or R



3,3200.15 to 0.250.30 to 0.600.040.0403.25 to 3.751.25 to 1.75 L

3,3300.25 to 0.350.30 to 0.600.040.0403.25 to 3.751.25 to 1.75 P or R

3,3400.35 to 0.450.30 to 0.600.040.0403.25 to 3.751.25 to 1.75 P or R

-------------------------------------------------------------------------------

* Another grade of this type of steel is available with chromium content

of 0.15 per cent to 45 per cent. It has somewhat lower physical properties.



TABLE 8.--CHROMIUM STEELS

-------------------------------------------------------------------------------

S. A. E.

Specification

no. --- Carbon Manganese Chromium

(minimum and(minimum andPhosphorusSulphur (minimum and Heat

maximum) maximum) (maximum) (maximum) maximum) treatment

-------------------------------------------------------------------------

5,120 0.15 to 0.25 * 0.04 0.045 0.65 to 0.85 B

5,140 0.35 to 0.45 * 0.04 0.045 0.65 to 0.85 H or D

5,165 0.60 to 0.70 * 0.04 0.045 0.65 to 0.85 H or D



5,195 0.90 to 1.050.20 to 0.45 0.03 0.03 0.90 to 1.10M, P or R

51,120 1.10 to 1.300.20 to 0.45 0.03 0.03 0.90 to 1.10M, P or R

5,295 0.90 to 1.050.20 to 0.45 0.03 0.03 1.10 to 1.30M, P or R

52,120 1.10 to 1.300.20 to 0.45 0.03 0.03 1.10 to 1.30M, P or R

-------------------------------------------------------------------------------

--Two types of steel are available in this class, one with manganese 0.25

to 0.50 per cent (0.35 per cent desired), and silicon not over 0.20 per

cent; the other with manganese 0.60 to 0.80 per cent (0.70 per cent

desired), and silicon 0.15 to 0.50 per cent.



TABLE 9.--CHROMIUM-VANADIUM STEELS

-------------------------------------------------------------------------------

S. A. E. Phosphorus Sulphur Vanadium

Specification (maximum)(maximum) (minimum)

no. ------ -- / -

Carbon Manganese Chromium Heat

(minimum and(minimum and (minimum and treatment

maximum) maximum) maximum)

------------------------------------------------------------------------

6,120 0.15 to 0.250.50 to 0.80 0.04 0.04 0.80 to 1.10 0.15 S

6,125 0.20 to 0.300.50 to 0.80 0.04 0.04 0.80 to 1.10 0.15 S or T

6,130 0.25 to 0.350.50 to 0.80 0.04 0.04 0.80 to 1.10 0.15 T or U

6,135 0.30 to 0.400.50 to 0.80 0.04 0.04 0.80 to 1.10 0.15 T or U

6,140 0.35 to 0.450.50 to 0.80 0.04 0.04 0.80 to 1.10 0.15 T or U

6,145 0.40 to 0.500.50 to 0.80 0.04 0.04 0.80 to 1.10 0.15 U

6,150 0.45 to 0.550.50 to 0.80 0.04 0.04 0.80 to 1.10 0.15 U

6,195 0.90 to 1.050.20 to 0.45 0.03 0.03 0.80 to 1.10 0.15 U

-------------------------------------------------------------------------------



TABLE 10.--SILICO-MANGANESE STEELS

-----------------------------------------------------------------------------

S. A. E.

Specification

no. ----- Carbon Manganese Silicon

(minimum and(minimum andPhosphorusSulphur (minimum and Heat

maximum) maximum) (maximum) (maximum) maximum) treatment

-----------------------------------------------------------------------

9,250 0.45 to 0.550.60 to 0.80 0.045* 0.045 1.80 to 2.10 V

9,260 0.55 to 0.650.50 to 0.70 0.045* 0.045 1.50 to 1.80 V

-----------------------------------------------------------------------------

* Steel made by the acid process may contain maximum 0.05 phosphorus.





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