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Name:AISI 4130 Alloy Steel (UNS G41300)
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Brief introduction: AISI 4130 Alloy Steel (UNS G41300)
AISI 4130 Steel | 25CrMo4 | 1.7218 | 708A25 | SCM430 Top sponsor listing 25crmo4/34CrMo4/42CrMo4/Scm430/435/Scb440/4130/4137/4140/5140 Carbon Steel Plate
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Product name
ASTM High Quality Chinese Factory Price Steel Pipes Welded Seamless Steel Tubes
Surface treatment
Cold/Hot rolled,Cold-Drawn,or Hot Forged
Outer Diameter
Processing Service
Welding, Punching, Cutting, Bending
Square, round, rectangular, customized
Application field
Marine applications, Fluid Pipe,Boiler Pipe,Drill Pipe,Hydraulic Pipe,Gas Pipe,OIL PIPE,Chemical Fertilizer Pipe,Structure Pipe
Oiled or Non-oiled:
Non-oiled or Slightly Oiled or Heavy Oiled or Shop primer and shot blasting

What is 4130 steel?

AISI 4130 alloy steel is a medium carbon, low alloy steel in ASTM A29 standard. ASTM 4140 steel is also commonly referred to as a chromoly steel, or chrome moly steel, containing nominally 0.28-0.33% Carbon, 0.8-1.1% Chromium and 0.15-0.25% Molybdenum. It is similar to 4140 steel which has a higher carbon level (0.28-0.33%), giving 4130 material improved weldability, at the expense of through thickness strength. With the proper heat treatment it is also readily machined. Annealing ASTM 4130 alloy steel offers excellent ductility. AISI 4130 steel is usually supplied as round bar commonly in the hardened and tempered condition.

AISI/SAE 4130 steel grade is a versatile alloy with good atmospheric corrosion resistance and reasonable strength up to around 315º C (600º F). It shows good overall combinations of strength, toughness and fatigue strength.

This AISI standard belongs to the ASTM A29 group.

ASTM A29 is the standard specification for carbon steels and alloyed structural steels to which the following AISI standards can be assigned.

Under the standardization AISI 4130, we understand the following material grades in the German material system:

1.7218 - 25CrMo4

AISI 4130 alloy steel is a low alloy medium carbon steel according to ASTM A29. AISI 4130 steel is commonly referred to as Chromoly steel or chrome moly steel.

It resembles the AISI 4140 (1.7225 / 42CrMo4) but has a lower carbon content (0.28-0.33%), giving the 4130 material improved weldability.

Standard Grade C Mn P S Si Cr Mo
ASTM A29 4130 0.28-0.33 0.40-0.60 <0.035 <0.040 0.15-0.35 0.80-1.10 0.15-0.25

With the right heat treatment (normalize, annealing), it is easy to work. In the tempered state, the processing is a little more demanding. Overall, it shows a good combination of strength, wear resistance and toughness.

Chemical composition

Weight % C Si Mn Cr Mo S P
Min.  0,28  0,15  0,40  0,80  0,15
Max.  0,33  0,35  0,60  1,10  0,25  0,035  0,025

Product Standards: ASTM A29 (4130), UNS G41300.
Approvals: NACE MR0175 when hardness is 22 HRC max., API 6A.

Mechanical Properties: BAR

Yield strength Rp0.2,
Tensile strength Rm,
Impact, Charpy-V, -32ºC
60 ksi  ≥ 414  ≥ 586  ≥ 18  22 MAX  ≥ 42
75 ksi  ≥ 517  ≥ 655  ≥ 17  22 MAX  ≥ 42

Other Designations

Other designations that are equivalent to AISI 4130 alloy steel include the following;

AMS 6348 AMS 6371 ASTM A331 ASTM A829 DIN 1.7218
AMS 6350 AMS 6373 ASTM A506 MIL S-18729 UNI 25 CrMo 4
AMS 6351 AMS 6374 ASTM A507 MIL S-6758 JIS SCCrM 1
AMS 6360 AMS 6528 ASTM A513 SAE J1397 JIS SCM 2
AMS 6361 AMS 7496 ASTM A519 SAE J404 SS 2225
AMS 6362 ASTM A29 ASTM A646 SAE J412 B.S. CDS 110
AMS 6370 ASTM A322 ASTM A752 AFNOR 25 CD 4 (S) SAE J770

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