SAE AISI 4130 Chromoly Steel, Alloy Material Properties, Chemical Composition

0 6,786

AISI 4130 Chromoly Steel (UNS G41300)

AISI 4130 steel (UNS G41300), also known as 4130 Chromoly steel, is a chrome-molybdenum series low alloy steel with high strength, toughness and hardenability, usually used in quenched and tempered condition.

Uses

AISI SAE 4130 alloy steel can be made into steel plate, steel sheet, round and flat steel bar, steel pipe and tube, etc. and has many uses in pressure vessels, pumps and valves, pinions, shaft gears, ball studs, screws, general purpose profile steel, automotive parts, oil and gas industry, aerospace, and bike frame, etc.

Datasheet & Specification

Below is material AISI 4130 Chromoly steel datasheet including chemical composition, density, thermal expansion coefficient, thermal conductivity, yield strength, hardness, etc.

AISI SAE 4130 Chemical Composition

The table below lists AISI 4130 chemical composition.

AISI 4130 Chemical Composition (%)
Steel Grade (UNS) C Si Mn P (≤) S (≤) Cr Mo
4130 (G41300) 0.28-0.33 0.15-0.35 0.40-0.60 0.035 0.040 0.80-1.10 0.15-0.25

AISI 4130 Material Properties

Material AISI 4130 steel mechanical properties are given in the table below.

Steel (UNS) Tensile strength (Mpa) Yield strength (Mpa) Elongation in 50 mm, % Reduction in area, % Hardness (HB) Sample diameter Conditions
AISI 4130 (G41300) 670 435 25.5 59.5 197 25mm (1 inch) Normalized at 870 °C (1600 °F)
560 460 21.5 59.5 217 Annealed at 865 °C (1585 °F)
1040 979 18.1 63.9 302 Water quenched from 855 °C (1575 °F) & tempered at 540 °C (1000 °F)

AISI SAE 4130 Physical Properties

Notes: 10-6/K = 10-6.K-1 = (µm/m)/°C

AISI SAE 4130 coefficients of linear thermal expansion
Value (10-6/K) Temperature (°C)
12.2 20-100
13.7 20-400
14.6 20-600
Material 4130 chromoly thermal conductivity
Value (W/m·K) Temperature (°C) Treatment or condition
42.7 100 Hardened and
tempered
40.6 300
37.3 500
31.0 700
Specific Heat of AISI 4130 Alloy Steel
Value (J/Kg·K) Temperature (°C) Treatment or condition
477 50-100 Hardened and
tempered
515 150-200
544 250-300
595 350-400
657 450-500
737 550-600
825 650-700
833 750-800
Electrical Resistivity of AISI SAE 4130 Alloy Steel
Value (μΩ·m) Temperature (°C) Treatment or condition
0.22 20 Hardened and
tempered
0.27 100
0.34 200
0.53 400
0.79 600
1.10 700
1.17 900
1.22 1000

SAE 4130 Steel Heat Treatment

The following table shows alloy 4130 chromoly steel heat treatment and rockwell hardness.

Chromoly 4130 Steel Heat Treatment
4130 Heat Treat Temperature (℃) Hardness Cooling/Agent
Normalizing 885 197 HB Air
Annealing 865 156 HB Furnace cooling
Quenching 800-855 Water
Tempering (2 hour) 204 47 HRC Water hardening
260 45 HRC
315 43 HRC
370 42 HRC
425 38 HRC
480 34 HRC
540 32 HRC
595 26 HRC
649 22 HRC

Normalizing

4130 alloy steel is typically normalized at 900 °C (1650℉), and should be cooled at a specified temperature in still air.

Spheroidizing Annealing

For spheroidizing annealing of 4130 alloy steel, it needs heat treated to 749 °C (1380 °F), followed by slowly cooling to 666 °C (1230 °F) at a rate of 6 °C (10 °F)/hour, or rapid cooling to 675 °C for 8 hours isothermal annealing.

Full Annealing

Heat treatment to 855 °C (1570 °F), slow cooling from 760 °C (1400 °F) at a rate of 18 °C (35 °F)/hour to 666 °C (1230 °F), or rapid cooling to 674 °C (1245 °F) for 4 hours isothermal annealing.

Tempering

Tempering temperature of 4130 alloy steel can be from 204-649 °C (400-1200°F) after normalizing and water quenching, and the corresponding Rockwell hardness can be obtained.

Forging

Material 4130 alloy steel forging temperature is about 1204 °C (2200 °F)

Welding 4130 Steel

All common arc welding processes, such as (SAW, SMAW, FCAW, GMAW, GTAW) can be used to weld 4130 alloy steel, but in order to prevent cracking, it must be preheated to 150-290 °C before welding, preheating interpass temperature depends on the section thickness of the steel.

Equivalent Grade

AISI 4130 equivalent to European EN (Germany DIN EN, British BSI, French NF…), Chinese GB and Japanese JIS standard.

AISI 4130 equivalent
USA European Union China Japan ISO
Standard Grade (UNS) Standard Grade Standard Grade (Steel Number) Standard Grade Standard Grade Standard Grade
AISI;
SAE;
ASTM A29/A29M
4130 (G41300) AMS AMS 6350; AMS 6345 EN 10083-3 25CrMo4
(1.7218)
GB/T 3077 30CrMo JISG 4105 SCM430
Subscribe to our newsletter
Leave A Reply

Your email address will not be published.

We use cookies to improve your experience on our website. By browsing this website, you agree to our use of cookies. Accept Read More