4130 Chromoly Alloy Steel Flat Bar
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GNEE 4130 Chromoly Steel Flat Bar introduce
4130 Chromoly Alloy Flat Bar
4130 Chrome-Moly Steel Flat Bar Overview
4130 Chrome-Mo Steel Flat Bars feature an optimized chromium-molybdenum alloy chemistry (Cr: 0.80-1.10%, Mo: 0.15-0.25%), providing excellent mechanical properties and making them the material of choice for highly stressed structural applications. Precision normalized at 870°C (1600°F) followed by controlled air cooling, these flat bars achieve a uniform fine-grained microstructure (ASTM No. 7-8) that provides a unique balance of:
Strength-to-weight advantage: quenched and tempered yield strength of 795 MPa (115 ksi) is 45% higher than comparable carbon steels, while maintaining ductility above 18% elongation. This enables 30% weight savings in machine frames and lifting components. Fatigue resistance: With a fatigue limit of 380 MPa (55 ksi) under cyclic loading (R= -1, 10⁷ cycles), it outperforms A36 steel by a factor of 2.8, which is critical for vibrating equipment such as compressor valve plates and hydraulic pump connecting rods.
Processing efficiency: With a hardness of 197-229 HB in the normalized state, turning speeds of up to 50 m/min are possible with carbide tools, reducing production time by 35% compared to tool steels while maintaining dimensional accuracy of ±0.025 mm.
Enhanced welding performance: Preheating welding with ER80S-D2 filler at 175-230°C results in defect-free joints with 95% of the parent material strength, which can be used to manufacture complex load-bearing components such as vehicle chassis reinforcements.
In harsh environments, 4130 flat steel exhibits excellent temperature adaptability: it can still maintain 85% of its room temperature strength at 400°F (204°C), while maintaining an impact toughness of more than 50 J (-40°F/-40°C) in low-temperature applications. Standard thickness ranges from 3-100 mm to meet a variety of engineering needs: thin precision-ground steel belts (10×30 mm, Ra≤0.8μm) for injection mold slides can withstand 800 tons of clamping force, while thick steel (50×200 mm) used as mining conveyor impact beds can resist 5,000 hours of wear.
GNEE 4130 Alloy Steel Flat Bar Specification Sheet
4130 Chromoly Flat Bar Technical Specification Table
|
Property |
Specifications |
|---|---|
|
Dimensions |
|
|
• Width |
10–300 mm (Common: 20/30/50/80 mm) |
|
• Thickness |
3–100 mm (Standard increments: 5mm/10mm) |
|
• Length |
3m/6m (Custom: 1–12m) |
|
Tolerances |
|
|
• Hot Rolled |
±0.5% width / ±1% thickness (ASTM A108) |
|
• Cold Finished |
±0.1mm (width≤50mm) / ±0.15mm (thickness≤20mm) (ASTM A484) |
|
Physical Properties |
|
|
• Density |
7.85 g/cm³ |
|
• Hardness |
|
|
- Annealed |
≤197 HB |
|
- Q&T |
28–35 HRC (AMS 6371) |
|
Mechanical Properties |
|
|
• Tensile Strength |
670 MPa (Annealed) → 930+ MPa (Q&T) |
|
• Yield Strength |
≥435 MPa (Annealed) → ≥795 MPa (Q&T) |
|
• Elongation |
≥17% (50mm gauge length) |
|
Composition |
|
|
• Alloy Elements |
C:0.28-0.33% Cr:0.80-1.10% Mo:0.15-0.25% Mn:0.40-0.60% Si:0.15-0.35% (AMS 6371) |
|
• Int'l Designations |
UNS K23030 / EN 1.7218 / JIS SCM430 |
|
Standards |
|
|
• General Standards |
ASTM A829 / EN 10083-1 |
|
• Aerospace Standards |
AMS 6371 / AMS 6372 |
|
• Automotive Standards |
SAE J404 / J412 |
|
Surface Finishes |
|
|
• Industrial Grade |
Hot Rolled Pickled (HRP) / Sandblasted (Sa2.5) / Peeled (PE) |
|
• Precision Grade |
Ground (Gr) Ra≤0.8μm / Polished (Po) Ra≤0.4μm |
|
• Protective Treatments |
Galvanized (ISO 1461) / Electroless Nickel (AMS 2404) |
|
Applications |
|
|
• Mold Manufacturing |
Stamping die ejectors (30×100mm) / Injection mold sliders (2×30mm) |
|
• Mechanical Engineering |
Guide rail press plates (50×150mm) / Gearbox shims (10×80mm) |
|
• Aerospace |
Landing gear linkages (AMS 6372 grade) / Engine mount shims |
|
• Energy Equipment |
Turbine seal strips (20×200mm) / Nuclear reactor clamping plates |
Specification of AISI 4130 Alloy Steel Flat Bar
|
Element |
Content (%) |
|
Carbon, C |
0.28-0.33% |
|
Manganese, Mn |
0.40-0.60% |
|
Silicon, Si |
0.15-0.35% |
|
Chromium, Cr |
0.80-1.10% |
|
Molybdenum, Mo |
0.15-0.25% |
GNEE 4130 Steel Flat Bar Schedule
4130 Chromoly Flat Bar Market Standard Size Chart
|
Metric Size (mm) |
Tolerance Range |
Surface Condition |
Standard Length |
Theoretical Weight (kg/m) |
||
|---|---|---|---|---|---|---|
|
10×50 |
±0.3×±0.7 |
HR + Picked |
3m / 6m |
3.93 |
||
|
20×60 |
±0.4×±0.8 |
HR + Sandblasted |
3m / 6m |
9.42 |
||
|
30×100 |
±0.5×±1.0 |
Cold Finished |
6m |
23.55 |
||
|
40×150 |
±0.6×±1.2 |
As-Rolled |
6m |
47.10 |
||
|
50×200 |
±0.7×±1.5 |
Precision Ground |
6m |
78.50 |
Imperial Size Equivalents
|
Inch Size |
Metric Equivalent (mm) |
Tolerance (in) |
|---|---|---|
|
0.5"×2" |
12.7×50.8 |
±0.012×±0.03 |
|
0.75"×3" |
19×76.2 |
±0.015×±0.03 |
|
1"×4" |
25.4×101.6 |
±0.02×±0.04 |
GNEE Group Factory Environment
GNEE Group 4130 Alloy Flat Bar Factory Environment
GNEE Group 4130 Chromoly Flat Bar Packaging
GNEE Group 4130 Steel Flat Bar Packaging
GNEE Group Testing
GNEE Group 4130 Flat Bar Testing
FAQ
1. What is AISI 4130?
AISI 4130 is a chromoly steel, also known as chrome moly steel. It's a medium-carbon, low-alloy steel popular for its balance of strength, toughness, and machinability.
2. Is chrome-molybdenum steel better than steel?
What distinguishes chrome-molybdenum steel from other types of steel is its higher tensile strength. This means it can withstand greater forces without breaking or deforming. It also has better corrosion resistance, making it ideal for applications exposed to harsh environments or moisture.
3. Will 4130 chrome-molybdenum steel rust?
Both 4140 and 4130 steels are low-alloy steels that have excellent strength, toughness, and corrosion resistance.
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