BAR STOCK

TOOL STEEL
AISI S1

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AISI S1 Shock Resistant Tool Steel
DESCRIPTION
General purpose, tungsten type of shock resisting tool steel. A versatile steel with excellent properties for cold battering tools and hot work shock applications. Low carbon content contributes to its toughness. Has sufficient carbide forming alloys to give ample abrasion resistance and depth of hardenability for the majority of shock tools. For additional wear resistance, carburize surface of tools during pack-hardening. Will still retain the shock resistance. Silicon content improves the hot work characteristics for shock tools at high temperatures.

ADVANTAGES
•Maximum shock resistance for cold or hot work applications
•Good wear resistance
•Good red-hardness value
TYPICAL ANALYSIS
CARBON ……………0.50 CHROMIUM ………..1.15

SILICON ……………0.75 TUNGSTEN ………..2.50

VANADIUM …………0.20

HEAT TREATMENT

FORGING ………………………………..2000°F to 2100°F, stop at 1600°F

NORMALIZING ………………………...Do not normalize

ANNEALING ……………………………1475°F, cool slowly. Brinell 212 max

PREHEATING ……………………………1200°F – prior to hardening

HARDENING …………………………….1750 °F, oil quench to 150°F

TEMPERING ……………………………...300° to 500° F cold work, hardness Rockwell c-57-64, 1000° F, for

hardness Rockwell C-47-42.

MACHINABILITY
In the thoroughly annealed condition, has a machinability rating of 75, as compared with a rating of 100 for a one percent carbon tool steel.

TEMPERING RESULTS
Specimens 1 in. diameter by 6 in. long were quenched in oil from 1750° F and tempered at 100°F intervals from 300°F, to 1200°F for one hour.

Tempering
Temperatures °F Hardness
Rockwell C
None 57
300 55
400 54
500 53
600 51
700 51
800 50
900 49
1000 47
1100 45
1200 42

Results may be used as a guide in tempering tools to desired hardness. However, since 1 in. diameter specimens were used in this test, tools of heavy section or mass may be several points lower in Rockwell hardness for a given treatment.

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