Steel 1.2343 vs 4130
Steel · grade comparison
Steel 1.2343 and 4130 are both steel grades. 1.2343 is the stronger of the two: yield strength 500 MPa (72.5 ksi) against 440 MPa (63.8 ksi) for 4130, about 14% more; tensile strength follows at 800 MPa (116 ksi) vs 700 MPa (102 ksi). In exchange, 4130 is the more ductile: elongation 22% versus 16% for 1.2343, and 4130 is harder (228 HV vs 215 HV). 4130 conducts heat better (42.7 W/m·K vs 24.5 W/m·K). On the shop floor, 4130 machines more easily (good vs fair) and 4130 welds better (good vs fair).
1.2343Choose it when strength drives the design.
4130Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
1.2343 vs 4130: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Rockwell C
Hardness, Vickers
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Min Service Temperature
Latent Heat of Fusion
Same in both: Max Service Temperature (continuous) 400°C752 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | 1.2343 | 4130 |
|---|---|---|
| Sheet metal | — | Yes |
| Default condition | Annealed | HR |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | 0.8 mm | 0.8 mm |
| Best machined surface | Ra 1.6 µm | Ra 1.6 µm |
Both are offered for CNC machining. Both take the same 38 finishes: AlCrN, AlTiN, Black Oxide, CVD Al2O3, CVD TiCN, CVD TiN, Cerakote, Chrome Plating, Copper Plating, CrN, DLC, E-Coating and 26 more.
1.2343 vs 4130 — frequently asked
Is 1.2343 stronger than 4130?
Yes. 1.2343 has a typical yield strength of 500 MPa (72.5 ksi) against 440 MPa (63.8 ksi) for 4130 — about 14% more. Tensile strength is 800 MPa (116 ksi) vs 700 MPa (102 ksi).
Which is cheaper, 1.2343 or 4130?
Both sit in the same relative cost tier ($$, standard); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, 1.2343 or 4130?
4130. Its machinability rates good (55/100) against fair (45/100) for 1.2343; for welding the order is 4130 first (good, 65/100) then 1.2343 (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.2343 and 4130 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.