1. Q: What are the material properties of E51100 steel pipe?
A: E51100 is a high-carbon chromium alloy bearing steel (corresponding to AISI 51100), with a carbon content of 0.98% to 1.10%, a chromium content of 0.90% to 1.15%, and a manganese content of 0.25% to 0.45%. Its core properties are:
Heat treatment can achieve an ultra-high hardness exceeding HRC 62;
The fine distribution of carbides provides excellent wear resistance;
Hardenability is superior to E50100 (due to the higher chromium content);
Weldability is extremely poor, requiring repair only by specialized processes.
2. Q: What is the typical mechanical property range for E51100?
A: After quenching and low-temperature tempering:
Tensile strength 2200-2500 MPa, yield strength 2000-2300 MPa;
Elongation approximately 2%-4% (low ductility);
Impact toughness 5-10 J (requires bainite treatment to increase to above 15 J);
Contact fatigue life 3-5 times that of ordinary carbon steel.
3. Q: What are the key control parameters for heat treatment?
A: Core process control points:
Spheroidizing annealing: 790°C x 4 h → 710°C x 8 h (hardness ≤ 207 HB);
Quenching: 810-840°C salt bath heating (austenitizing time calculated as 1 min/mm), oil quenching or step quenching;
Tempering: 160-180°C x 2 h (hardness HRC 62+), hardness significantly decreases above 200°C;
Cold treatment: -70°C x 1 h (reduces retained austenite and improves dimensional stability). 4. Q: How does it compare to E52100 steel?
A: Main differences:
Composition: E51100 has a lower chromium content (0.9%-1.15%) than E52100 (1.3%-1.6%), resulting in lower cost.
Performance: E52100 offers superior corrosion resistance and high-temperature performance, but E51100 can achieve similar wear resistance through optimized heat treatment.
Application: E51100 is suitable for small and medium-sized bearings (<100mm thick), while E52100 is used for large or high-precision bearings.
5. Q: What are some typical applications and precautions?
A: Main Applications:
Precision bearing rollers/rings (such as machine tool spindle bearings);
High-stress cutting tools (cold stamping dies, ceramic cutting tool substrates);
Special wear-resistant parts (metering pump rotors, aerospace gears);
Note:
Surface treatment (such as electroless nickel plating) is required for corrosion protection;
Machining requires CBN or diamond tools;
Avoid prolonged use in acidic environments or at temperatures above 300°C.
