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.