Detailed Analysis of SA387 Gr22 Steel Plate: Comparison and Advantages Over Other Alloy Steels

14 10 月, 2025

Introduction

Imagine you’re searching for steel for a critical refinery project: it must withstand extreme heat and pressure, resist corrosion, and ensure equipment durability for years to come. If you’ve searched “SA387 Gr22 vs other alloy steels,” you’ve likely heard about SA387 Gr22‘s exceptional performance—but what makes it truly unique? In this article, we’ll delve into the specifications and performance of SA387 Gr22 steel plates, exploring how it stands out among alloy steels to deliver a reliable solution for your project. Let’s discover why it has become a top choice for steel buyers worldwide!

Basic Introduction of SA387 Gr22

SA387 Grade 22 steel plate, conforming to the ASME SA387 Grade 22 standard, is a chromium-molybdenum alloy steel specifically engineered for high-temperature and high-pressure environments. Its core composition includes approximately 2.25% chromium and 1% molybdenum, imparting exceptional heat resistance and corrosion resistance. Below are its primary specifications:

Standard：ASME SA387 Grade 22（Class 1 and Class 2）。
Thickness range：6mm to 150mm for a wide range of customisation needs.
Primary Chemical Composition(Class 2)：
- Carbon（C）：0.04-0.15%
- Silicon（Si）：≤0.50%
- Manganese（Mn）：0.25-0.66%
- Chromium（Cr）：1.88-2.62%
- Molybdenum（Mo）：0.85-1.15%

These components ensure SA387 Gr22 maintains stability at elevated temperatures, making it particularly suitable for pressure vessel and boiler fabrication.For further specifications, refer to The American Society of Mechanical Engineers.

Core Performance Indicators of SA387 Gr22

SA387 Gr22 demonstrates exceptional performance in high-temperature, high-pressure environments. Key specifications are as follows:

Tensile strength: 515-690 MPa for Class 2, 415-585 MPa for Class 1.
Yield strength: Class 2 ≥310 MPa, Class 1 ≥205 MPa.
Heat resistance: Long-term operation in environments up to 600°C and high resistance to oxidation.
Corrosion resistance: The chromium-molybdenum composition effectively resists corrosion by acid gases and sulphides.

These properties make SA387 Gr22 an indispensable material in the refining, chemical and power generation industries, especially in equipment that requires long-term stable operation. For more on mechanical testing, see The American Society of Mechanical Engineers.

Comparison with Other SA387 Grades

The SA387 series consists of several grades such as Gr5, Gr11 and Gr91, each with unique advantages. Below is a comparison of SA387 Gr22 with other grades:

Causality	SA387 Gr22	SA387 Gr11	SA387 Gr5	SA387 Gr91
Chromium Content	2.00-2.50%	1.00-1.50%	4.00-6.00%	8.00-9.50%
Molybdenum Content	0.90-1.10%	0.45-0.60%	0.45-0.65%	0.85-1.05%
Tensile Strength (MPa)	515-690	515-690	415-585	585-760
Maximum Working Temperature	~600°C	~550°C	~500°C	~650°C
Major Application	pressure vessels, boilers	medium temperature vessel	corrosion-resistant equipment	high temperature and high pressure equipment

Gr22 vs Gr11：Gr22 has a higher chromium-molybdenum content and is more heat resistant for higher temperature environments.
Gr22 vs Gr5：Gr5 has a higher chromium content for greater corrosion resistance, but is inferior to Gr22 in high-temperature strength.
Gr22 vs Gr91：Gr91 is better suited to extreme temperatures but is more costly, and Gr22 is superior in terms of price/performance.

Scenario Differences：Gr22 is widely used in pressure vessels in refineries and power plants, Gr11 is more suited to medium-temperature environments, Gr5 is used in more corrosive scenarios, and Gr91 is used for extreme high-temperature projects.

Conclusion

SA387 Gr22 steel plate is ideal for pressure vessel and boiler fabrication due to its excellent heat and corrosion resistance and cost effectiveness. Gr22’s balanced performance in high-temperature and high-pressure environments compared to Gr11, Gr5 and Gr91 has made it popular across multiple industries. Whether you’re a purchasing leader in a refinery, power plant, or chemical company, SA387 Gr22 can reliably support your project.

If you are still hesitant or have any questions, please feel free to contact Henan Hennes. We have a dedicated account manager system and a first order system for new customers, and a professional consulting team ready to help you. With sufficient inventory, customised rolling capacity and efficient logistics system, we are able to respond quickly to diversified customer orders and provide stable and reliable spot resources and efficient futures order service.