Key Takeaways
- 14Cr1MoR is a Cr-Mo low-alloy high-strength steel plate for high-pressure vessels, boilers and pressure pipes.
- Chromium and molybdenum provide high-temperature strength, oxidation resistance and corrosion resistance.
- Typical mechanicals (per GB/T 713): yield ≥345 MPa, tensile 510-690 MPa, elongation ≥19%, -20°C CVN ≥47 J average.
- Welding of Cr-Mo steels requires preheating and post-weld heat treatment (PWHT).
1. Composition of 14Cr1MoR Steel
| Element | Melting analysis (%) |
|---|---|
| Carbon | 0.05-0.17 |
| Silicon | about 0.50-0.80 (typical; confirm edition) |
| Manganese | 0.40-0.65 |
| Phosphorus / Sulfur (max) | 0.010 / 0.010 (hydrogen-service grade) |
| Chromium | 1.15-1.50 |
| Molybdenum | 0.45-0.65 |
Values per GB/T 713; the P/S ≤0.010 limits correspond to the hydrogen-service grade - confirm the applicable grade with the order.
2. Performance Characteristics
High strength: excellent mechanical properties, especially significant strength and hardness in high-temperature and high-pressure environments.
- Good heat resistance: because 14Cr1MoR contains chromium and molybdenum, it has good high-temperature resistance, oxidation resistance and corrosion resistance, suitable for high-temperature and high-pressure vessels and pipelines.
- Good processability: the plate can be cut, formed (cold or hot forming), machined and heat-treated, with a low rate of defects such as easy deformation and fracture.
- Good weldability: Cr-Mo steels weld well with proper procedure control; because of the hardenability of the chromium-molybdenum system, preheating and post-weld heat treatment (PWHT) are normally required to avoid cold cracking and to restore toughness in the heat-affected zone.
3. Typical Mechanical Properties
| Property | Typical value |
|---|---|
| Yield strength (min) | 345 MPa |
| Tensile strength | 510-690 MPa |
| Elongation (min) | 19% |
| Impact at -20°C (min) | 47 J average; 31 J single |
Typical values per GB/T 713; requirements vary with plate thickness - confirm with the standard and the order.
4. Applications of 14Cr1MoR
14Cr1MoR is mainly used in the manufacture of high-pressure vessels, boilers and pressure pipes, widely applied in large-scale equipment manufacturing in the chemical, petroleum and natural-gas industries, including hydrogen-service equipment such as hydrotreating reactors. It has approximate correspondence to ASTM A387 Gr.12 and EN 13CrMoSi5-5 (approximate, not exact equivalents). Nuclear-power application would require dedicated nuclear material specifications (e.g. RCC-M or ASME nuclear codes) and is outside the scope of conventional GB/T 713 supply.
Ready to source 14Cr1MoR for your pressure vessel, boiler, or hydrotreating reactor project?
GNEE Steel supplies full-thickness plates per GB/T 713, complete with mill test certificates, tensile/impact reports, and dimensional declarations. Our technical team can also advise on preheating and PWHT parameters to help you avoid cold cracking and ensure a smooth fabrication process.
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Frequently Asked Questions
Q1. What are the mechanicals of 14Cr1MoR?
Yield ≥345 MPa, tensile 510-690 MPa, elongation ≥19%, -20°C impact ≥47 J average (typical per GB/T 713).
Q2. Why is PWHT needed after welding?
Cr-Mo steels are hardenable; preheat plus PWHT prevents cold cracking and restores HAZ toughness.
Q3. What is 14Cr1MoR equivalent to?
Approximately ASTM A387 Gr.12 and EN 13CrMoSi5-5; confirm by comparison of specified values.
Q4. Can it be used in nuclear plants?
Nuclear-grade use requires dedicated nuclear material specifications; conventional supply is for general pressure-vessel service.
Disclaimer:
The technical data, composition, mechanical properties, and application examples provided in this article are for general reference purposes only. Actual product performance may vary depending on plate thickness, heat treatment, manufacturing practice, and applicable order specifications. Please always refer to the actual mill test certificates and the specific standard edition (e.g., GB/T 713) valid at the time of order.
