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4130 is a Chromium-Molybdenum alloy steel. It is one of the most used aircraft steels because of 4130’s ease of manufacturing and weldability. It is also known for its hardenability, strength and ductility. If additional abrasion and wear resistance are needed this material can be provided in a nitrided condition.

Chemical Properties

Element	min	max
Carbon	0.28	0.33
Manganese	0.40	0.60
Silicon	0.15	0.35
Phosphorus	—	0.025
Sulfur	—	0.025
Chromium	0.80	1.10
Molybdenum	0.15	0.25
Nickel	—	0.25
Copper	—	0.35

Mechanical Properties, Longitudinal , Minimum (Hardened and Tempered)

Property	Value
Tensile strength	125 ksi
Yield strength at 0.2% Offset	100 ksi
Elongation in 4D	17%
Reduction of Area	55%

Select AMS Number:

AMS Number	Alloy	Type	UNS	Cross Ref. Spec	Misc./Shape
AMS 6345	4130	Steel	G41300
AMS 6345 Plate Currently Out Of Stock	4130	Steel	G41300	-	Plate
AMS 6345 Sheet Currently Out Of Stock	4130	Steel	G41300	-	Sheet
AMS 6345 Strip Currently Out Of Stock	4130	Steel	G41300	-	Strip
AMS 6346 Currently Out Of Stock	4130	Steel	G41300	-	Bar
AMS 6348 Currently Out Of Stock	4130	Steel	G41300	AMS-S-6758	Bar
AMS 6350	4130	Steel	G41300
AMS 6350 Plate Currently Out Of Stock	4130	Steel	G41300	MIL-S-18729	Plate
AMS 6350 Sheet Currently Out Of Stock	4130	Steel	G41300	MIL-S-18729	Sheet
AMS 6350 Strip Currently Out Of Stock	4130	Steel	G41300	MIL-S-18729	Strip
AMS 6351	4130	Steel	G41300
AMS 6351 Plate Currently Out Of Stock	4130	Steel	G41300	-	Plate
AMS 6351 Sheet Currently Out Of Stock	4130	Steel	G41300	-	Sheet
AMS 6351 Strip Currently Out Of Stock	4130	Steel	G41300	-	Strip
AMS 6360 Currently Out Of Stock	4130	Steel	G41300	MIL-T-6736	Tubing
AMS 6361 Currently Out Of Stock	4130	Steel	G41300	-	Tubing
AMS 6362 Currently Out Of Stock	4130	Steel	G41300	-	Tubing
AMS 6370	4130	Steel	G41300
AMS 6370 Bar Currently Out Of Stock	4130	Steel	G41300	MIL-S-6758	Bar
AMS 6370 Forging Currently Out Of Stock	4130	Steel	G41300	MIL-S-6758	Forging
AMS 6370 Ring Currently Out Of Stock	4130	Steel	G41300	MIL-S-6758	Ring
AMS 6371 Currently Out Of Stock	4130	Steel	G41300	MIL-T-6736	Tubing
AMS 6373 Currently Out Of Stock	4130	Steel	G41300	MIL-T-6736	Tubing
AMS 6374	4130	Steel	G41300
AMS 6374 Round Currently Out Of Stock	4130	Steel	G41300	-	Round
AMS 6374 Tubing Currently Out Of Stock	4130	Steel	G41300	-	Tubing
AMS 6528 Currently Out Of Stock	4130	Steel	G41300	-	Bar
AMS S 18729	4130	Steel	-
AMS S 18729 Plate Currently Out Of Stock	4130	Steel	-	MIL-S-18729C	Plate
AMS S 18729 Sheet Currently Out Of Stock	4130	Steel	-	MIL-S-18729C	Sheet
AMS S 18729 Strip Currently Out Of Stock	4130	Steel	-	MIL-S-18729C	Strip
AMS T 6736A Currently Out Of Stock	4130	Steel	-	MIL-T-6736B	Tubing