Aircraft steel
Chrome-Moly Aircraft Steel 4130 (AMS 6345/ AMS 6346 / AMS 6350)

Technical Data Sheet

Chemical Composition Limits
Weight% C Mn P S Si Cr Ni Mo Cu
4130 Bar/Tube 0.28 – 0.33 0.40-0.60 0.025 max 0.025 max 0.15 – 0.35 0.80-1.10 0.25 max 0.15-0.25 0.35
4130 Sheet/Plate 0.28 – 0.33 0.40 – 0.60 0.025 max 0.025 max 0.20-0.35 0.80-1.10 0.15 – 0.25

Alloy 4130 (AISI 4130) is a chromium molybdenum alloy steel. Alloy 4130 is a widely used Aircraft Steel due to its weldability, ease of fabrication and mild hardenability. The hardenability and weldability of Alloy 4130 are considered equivalent to 8630 (MIL-S-6250) . Alloy 4130 is also vacuum degassed to meet the magnetic particle inspection standards of AMS 2301.

What type of steel is 4130?
Aircraft quality 4130 alloy steel is a medium carbon, low alloy steel containing 0.15/0.25% molybdenum and 0.80/1.10% chromium as strengthening agents. This type of steel is also commonly referred to as a chromoly steel, or chrome moly steel.

AMS 6345 – AISI 4130 (E4130) Cold Rolled Aircraft Steel Sheet Table

Alloy Steel Grade 4130 Steel per AMS 6345 & 6350
SIZE
INCHES
WGT./
SQ.FT.
18″ X 72″ 36″ X 72″ 72″ X 144″
NORMAL
0.025 1.0455 CR CR
0.032 1.3382 CR CR
0.040 1.6728 CR CR
0.050 2.03 CR CR
0.063 2.637 CR CR
0.071 2.9692 HR HR
0.080 3.3456 HR HR  –
0.090 3.7638 HR HR
0.100 4.07 HR HR
0.125 5.09 HR HR HR
0.160 6.6912 HR HR HR
0.190 7.9485 HR HR HR
0.250 10.20 HR HR HR
0.3125 12.75 HR HR HR
0.375 15.30 HR HR HR
0.500 20.40 HR HR HR
0.625 25.50 HR HR HR
0.750 30.60 HR HR HR
1 40.80 HR HR HR
1 1/8 45.90 HR HR HR
1 1/4 51.00 HR HR HR
1 1/2 61.20 HR HR HR
  • Material may also meet specs ATSM-A505 & ASTM-A506 (Sheets only, Chemistry only). AMS-2301, EN10204 for your 4130 steel sheet metal material requirements.
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