Detailed Analysis of 4130 and S355J2 Low Alloy High Strength Steel Plates

These two steels belong to different standard systems, with significant differences in application scenarios and performance characteristics:

I. 4130 Low Alloy High Strength Steel Plate

1. Standard and Grade Interpretation

Standard: American ASTM standards (e.g., ASTM A29/A29M) or ASME standards, classified as alloy structural steel (not purely low alloy high strength steel, more inclined to quenched and tempered steel).

Grade Meaning:

41: Indicates chromium-molybdenum steel series (Cr-Mo alloy).

30: Carbon content ~0.30% (medium carbon level).

2. Chemical Composition (%,Typical Values)

Element	C	Si	Mn	P	S	Cr	Mo
Content	0.28-0.33	0.15-0.35	0.40-0.60	≤0.035	≤0.040	0.80-1.10	0.15-0.25

 

 

 

 

3. Mechanical Properties (Quenched and Tempered State, Thickness ≤100mm)

Item	Value (Minimum)
Yield Strength ReL	≥485 MPa
Tensile Strength Rm	655-835 MPa
Elongation A5	≥18%
Impact Absorption Energy	≥47 J (Room Temperature, Charpy V-Notch)

4. Characteristics

Medium Carbon Quenched and Tempered Steel: Achieves high strength, toughness, and wear resistance through quenching + tempering (quenching and tempering treatment), but poor weldability (requires preheating and post-weld heat treatment).

Role of Alloying Elements:

Cr/Mo: Improve hardenability, heat resistance, and fatigue resistance, suitable for applications under alternating loads and high temperatures.

Medium Carbon Content: Sacrifices some weldability for high strength and hardness.

 

 

 

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