7/31/2019 AISI D7

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111

The data presented herein are typical values, and do not warrant suitability for any specific application or use of this materia

Normal variations in the chemical composition, the size of the product, and heat treatment parameter may result in different valu

for the various physical and mechanical properties.

AISI D7____________

TYPICAL ANALYSIS

Carbon........

2.30%

Manganese.....

.40%

Silicon.......

.40%

Chromium......12.50

%

Vanadium......

4.0%

Molybdenum....

1.10%

Tempering

Temp. (F) Hardness

As-quenched Rc

300 65

400 63

500 62

600 61

700 61

800 61

900 62

1000 62

Uses . . . Brick mold liners, brick mold die plates, weresisting parts, ceramic tools and dies, briquetting die

deep drawings dies, flattening rolls, and lamination dies

Forging . . . Preheat to 1200 to 1300 F (650 to 705 C). Stforging at 2050 to 2125 F (1020 to 1165 C) and do n

forge below 1800 F (980 C). Slow cool.

RECOMMENDED HEAT TREATING PRACTICE

Normalizing . . . Do not normalize.

Annealing . . . Surface protection in the form of atmospheric gas with proper dew point, a nonoxidizing molt

salt bath, or an inert pack material (such as spent pit

coke), is required. Heat slowly and uniformly to 1600

1650 F (870 to 900 C). Use lower limit for small sectio

and upper limit for large sections. Holding time varies fr

1-1/4 hr for light sections to 6 hr for heavy sections a

large charges. About 1-1/2 hr per inch of thickness is

adequate approximation to follow. For pack annealing, ho

for about 1-1/4 hr per inch of cross section of the pac

Cool slowly at a rate not to exceed 40 F (22 C) per ho

until 1000 F (540 C) is reached, after which cooling ra

is not critical. Typical annealed hardness, 217 to 255 HB

Stress Relieving . . . Optional. Heat to 1250 to 1300 F (675 705 C) for 1 hr per inch of cross section (minimum of

hr). Air cool.

Hardening . . . Heat slowly. Preheat at 1500 F (815 C) aaustenitize at 1950 F (1065 C). Hold at temperature for

min for small tools and 1 hr for large tools. Quench in a

cooling as evenly as possible on all sides. Approxim

quenched hardness, 66 HRC.

Paxton & Vierling SteelE S T A B L I S H E D 1 8 8 5

Phone 712-347-5500 800-831-9252

Fax 712-347-6166

7/31/2019 AISI D7

2/2

112

The data presented herein are typical values, and do not warrant suitability for any specific application or use of this materia

Normal variations in the chemical composition, the size of the product, and heat treatment parameter may result in different valu

for the various physical and mechanical properties.

Tempering . . . Temperimmediately at 300 to

1000 F (150 to 540 C)

after tool has cooled to

about 120 to 150 F (49

to 66 C). Doubletemper, allowing tool to

cool to room temperature

before second temper.

Range of hardness after

tempering, 62 to 65 HRC.