1.4021 qt800 vs.1.4021 qt700 : Strength
Jul 16, 2025
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If you are sourcing 1.4021 martensitic stainless steel for high-strength applications such as shafts, valves or wear parts, you may come across the grades 1.4021 QT700 and 1.4021 QT800. We will explain the differences between 1.4021 QT700 and QT800 and help you decide which grade is best for your project.
What Material Is 1.4021 QT700?
1.4021 QT700 is the quenched and tempered (QT) version of EN 1.4021 stainless steel, equivalent to AISI 420. QT700 means that a minimum tensile strength of 700 MPa can be achieved by heat treatment. Its main applications are shafts, bolts, pump components, mildly corrosive environments.
What Material Is 1.4021 QT800?
1.4021 QT800 is the same as the base steel (AISI 420 / EN 1.4021), but tempered to give higher strength, with a tensile strength of at least 800 MPa. It has higher mechanical strength and wear resistance than QT700 and is suitable for applications with higher loads or impact stresses, mainly in valve stems, turbine blades, and highly stressed parts.
What is the difference between 1.4021 +QT800 and 1.4021 +QT700?
The difference between 1.4021 +QT800 and 1.4021 +QT700 is the minimum tensile strength, with QT800 indicating a higher minimum tensile strength than QT700, although both are EN 1.4021 stainless steel in the quenched and tempered condition. The number following "+QT" designates the minimum yield strength in MPa after quenching and tempering, so QT800 signifies a higher minimum yield strength than QT700.
chrome steel 1.4021+QT800 equivalent
If you're searching for 1.4021+QT800 equivalents, here's how it compares internationally:
| Standard | Equivalent Grade |
|---|---|
| AISI | 420 |
| DIN | X20Cr13 |
| UNS | S42000 |
| GB (China) | 20Cr13 |
| ISO | X20Cr13+QT800 |
Mechanical Properties Comparison: 1.4021 QT800 vs. 1.4021 QT700
| Property | 1.4021 QT700 | 1.4021 QT800 |
|---|---|---|
| Tensile Strength (Rm) | ≥ 700 MPa | ≥ 800 MPa |
| Yield Strength (Rp0.2) | ~450 MPa (typical) | ~550 MPa (typical) |
| Elongation (A5) | ≥ 15 % | ≥ 12 % |
| Hardness (HBW) | 200 – 230 HB | 230 – 260 HB |
| Impact Toughness | Higher (softer temper) | Lower (harder temper) |
| Wear Resistance | Moderate | Improved |
| Weldability | Limited, preheating recommended | Limited, preheating recommended |
| Heat Treatment State | Quenched & tempered to 700 MPa | Quenched & tempered to 800 MPa |
✅ Conclusion: Choose QT700 for applications requiring more ductility and QT800 for parts that need higher wear strength or mechanical load capacity.
1.4021 qt800 vs.1.4021 qt700 : Strength
The strength of 1.4021 QT800 is higher than that of 1.4021 QT700, with a minimum tensile strength (Rm) of 800-950 MPa, while that of QT700 is 700-850 MPa. QT800 has a higher yield strength (> 600 MPa), while QT700 has superior ductility (elongation > 13%) and toughness.
Why Choose GNEE for 1.4021 QT700 / QT800 Chrome Steel bar ?
✅ Strict Heat Treatment Control – All QT grades meet tensile class requirements (700/800 MPa)
✅ Custom Machining Services – Cut-to-length bars, ground shafts, CNC-processed parts available
✅ Full Certification – EN 10204 3.1 / 3.2, with mill test report and mechanical data
✅ Reliable Lead Times – 5–10 working days for standard sizes; expedited delivery available
✅ Global Export Packaging – Anti-corrosion coating + wooden crate export-ready solutions
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