Chemical Composition of AISI 4145H Forged hollow bars

Element

Composition

C

0.43 - 0.48 %

Mn

0.75 - 1.0 %

P

<= 0.035 %

S

<= 0.040 %

Si

0.15 - 0.30 %

Cr

0.80 - 1.1 %

Mo

0.15 - 0.25%

Mechanical Properties of AISI 4145H mod forged hollow bars

Test Location

Refer to Table 1

Yield Strength @ 0.2 %

120,000 psi min

Tensile Strength%

140,000 psi min

Elongation% 2" Gauge Length

13% min

Impact Test Temperature

70 ºF (RT)

-4 ºF (± 5 °F)

Impact Value (Avg. of 3 specimens)

40 ft-lbs Min

31 ft-lbs Min

Impact Value (Min. single value)

35 ft-lbs min

24 ft-lbs min

Surface Hardness (BHN)

285 BHN min

Through Wall Hardness (BHN)

285 BHN (Refer to Figure 1 & Table 2)

Straightness

1/160 inch per ft

Surface Finish & OD Tolerances of AISI 4145 forged hollow bars

Size Outside Diameter

Size tolerance inclusive

Out of Roundness

max

min

2-1/2” to 3-1/2”

3/64”

0

0.035”

3-1/2” to 4-1/2”

1/16”

0

0.046”

4-1/2” to 5-1/2”

5/64”

0

0.058”

5-1/2” to 6-1/2”

1/8”

0

0.070”

6-1/2” to 8-1/4”

5/32”

0

0.085”

8-1/4” to 9-1/2”

3/16”

0

0.100”

Over 9-1/2”

¼”

0

0.120”

Markings

Heat Number and Bar Number must be Stenciled on each bar

Bore Eccentricity Allowed

1/16"

NDT Required

• The Ultrasonic Inspection reference standard shall be ASTM E 213.

• Magnetic Particle inspection reference standard shall be ASTM E3024.

• Liquid Penetrant Inspection reference standard shall be ASTM E165.

• Eddy Current Inspection reference standard shall be either ISO 10893 or ASTM E309

Destructive Tests Required

• Hardness measurement standard shall be ASTM A370 and ASTM E10.

• Impact strength requirements reference shall betaken from ASTM A370 and ASTM E23.

• Tensile Strength requirements shall betaken from ASTM A 370.

Bar OD

Testing Location

Through 7-1/2” OD

1” Below the surface and Mid-Radius

Over 7-1/2” OD

1” Below the surface and 1-3/4” above the center

Bar OD

ID

4-3/4” to 6-1/2”

2-1/2”

6-3/4” to 7-1/2”

2-9/16

7-3/4” to 8-1/2”

2-13/16”

8-3/4” to 10”

3”