SA 387 Gr 11 Plates vs Other Steel Plates: Comprehensive Industrial Comparison

SA 387 Gr 11 is a 1.25Cr-0.5Mo low-alloy steel plate certified to ASME SA-387/SA-387M, engineered for high-temperature (up to 593°C/1100°F) and high-pressure applications like tube shell heat exchangers, pressure vessels, and petrochemical reactors. Its unique blend of creep resistance, oxidation protection, and weldability sets it apart from other steel plates- but choosing the right material depends on your project's temperature, pressure, corrosion, and cost requirements.

As a leading supplier of industrial steel plates and tube shell heat exchangers, GNEE compares SA 387 Gr 11 to the most commonly used competing grades (carbon steel, higher Cr-Mo alloys, stainless steel, and international equivalents) to help you make informed decisions.

SA 387 Gr 11 Plates are chromium molybdenum alloy steel plates primarily used in pressure vessels, heat exchangers and boilers at high temperatures.

They are made of chromium-molybdenum alloy with an added amount of carbon, which increases their strength and provides outstanding corrosion resistance properties.

Despite extreme working conditions, these stainless steel plates offer excellent oxidation and corrosion resistance due to their superb tensile strength and low-temperature toughness.

In addition, they have superior creep characteristics making them the ideal choice for various engineering projects where weight savings is critical.

Steel plates are large pieces of metal, typically in flat shapes with squared corners and sides, used in various applications across many industries. Generally made from iron or steel alloy that is heated and hammered into shape, steel plates provide strength and durability for structures such as bridges, ships, buildings, vehicles, railroads, industrial machinery and equipment frames.

Steel plates are also found in everyday products such as kitchen appliances and furniture components. Their heat-resistant qualities make them ideal for fabricating cookware.

1. SA 387 Gr 11 vs SA 516 Gr 70 (Carbon Steel)

The Most Common Comparison for Pressure Vessels & Heat Exchangers

Alloy & Performance: SA 387 Gr 11's Cr-Mo alloying delivers 111°C higher service temperature (593°C vs. 482°C) and superior creep/oxidation resistance-critical for tube shell heat exchangers operating above 450°C. SA 516 Gr 70 (plain carbon steel) lacks alloy additives, making it unsuitable for high-temperature or sour service (H₂S environments).

Applications:

SA 516 Gr 70: Cost-effective for low-to-moderate temp/pressure equipment (e.g., water tanks, HVAC heat exchangers).

SA 387 Gr 11: Mandatory for heavy-duty tube shell heat exchangers (refineries, power plants) and sour service vessels.

2. SA 387 Gr 11 vs SA 387 Gr 22 (2.25Cr-1Mo)

Cr-Mo Alloy Upgrade for Extreme Conditions

Alloy & Performance: SA 387 Gr 22 has double the Cr/Mo content of Gr 11, enabling a 56°C higher max service temperature (649°C vs. 593°C) and better resistance to hydrogen attack. It also offers 10–20% higher yield strength (345 MPa Class 2 vs. 310 MPa).

Applications:

SA 387 Gr 11: Ideal for tube shell heat exchangers and vessels operating at 500–593°C (e.g., steam condensers, medium-pressure reactors).

SA 387 Gr 22: For ultra-high-temp equipment (e.g., petrochemical cracking reactors, superheaters) or harsh sour service.

3. SA 387 Gr 11 vs SA 285 Gr C (Low-Carbon Steel)

Budget vs. Performance for Non-Critical Use

Strength & Temp Resistance: SA 285 Gr C has significantly lower yield strength (170 MPa vs. 240 MPa) and max service temperature (427°C vs. 593°C). It is a low-cost, low-performance option for non-critical, low-pressure vessels (e.g., atmospheric storage tanks).

Key Difference: SA 387 Gr 11 is engineered for critical applications where failure risks safety or downtime (e.g., tube shell heat exchangers in refineries), while SA 285 Gr C is for non-essential equipment.

4. SA 387 Gr 11 vs EN 10028-3 13CrMo4-5 (European Equivalent)

Global Standard Compatibility

Composition & Performance: These grades are near-identical (1.25Cr-0.5Mo) with matching service temperature (593°C) and corrosion resistance. The only difference is certification: SA 387 Gr 11 (ASME) vs. 13CrMo4-5 (EN/PED for European markets).

Applications:

SA 387 Gr 11: Preferred for projects requiring ASME Section II certification (e.g., U.S., Middle East, Asia).

13CrMo4-5: Required for European Union projects compliant with the Pressure Equipment Directive (PED).

5. SA 387 Gr 11 vs 304 Stainless Steel

Corrosion Resistance vs. High-Temp Strength

Performance Tradeoffs: 304 stainless steel offers superior corrosion resistance (ideal for chemical media like acids) but lower high-temperature strength and creep resistance than SA 387 Gr 11. At 593°C, 304's tensile strength drops by 40%, while SA 387 Gr 11 retains 70% of its room-temperature strength.

Applications:

304 Stainless Steel: Chemical process equipment, marine heat exchangers, and corrosive environments.

SA 387 Gr 11: High-temperature tube shell heat exchangers, refinery vessels, and sour service (where stainless steel may suffer from chloride stress corrosion cracking).

SA 387 Gr 11 is the optimal choice if your project meets any of these criteria:

• Operating temperature between 482°C–593°C (1100°F) (exceeds carbon steel limits).
• Requires resistance to sulfide stress corrosion cracking (SSCC) or hydrogen attack (sour service).
• Critical equipment (tube shell heat exchangers, pressure vessels) where reliability and safety are non-negotiable.
• Compliance with ASME standards for global markets.

At GNEE, we supply ASME/EN/ASTM-certified steel plates (including SA 387 Gr 11, SA 516 Gr 70, SA 387 Gr 22, and EN 10028-3 13CrMo4-5) tailored to your tube shell heat exchanger and pressure vessel needs.

Our offerings include:

• Custom thicknesses (6mm–200mm) and sizes for seamless integration into equipment designs.
• Rigorous testing (UT, HIC, SSCC, Charpy V-notch) to meet critical application requirements.
• One-stop fabrication of tube shell heat exchangers using the optimal steel grade for your operating conditions.
• Global delivery with full certification (MTR, ASME Section II, PED) for international compliance.

SA 387 Gr 11 plates strike a balance between high-temperature performance, corrosion resistance, and cost that makes them the gold standard for critical industrial equipment like tube shell heat exchangers. Compared to carbon steel (SA 516 Gr 70, SA 285 Gr C), they offer superior durability in harsh conditions; compared to higher-alloy (SA 387 Gr 22) or stainless steel (304), they provide better value for moderate-to-high temperature applications.

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What is SA387 grade 11 equivalent to?

Sa 387 Gr 11 Equivalent Material is the ASME SA387 in the US markets with the European Union having modules in 13CrMoSi5-5 grade. The Sa 387 Gr 11 Cl 2 Equivalent Material is the SA387-11-2 of the ASME and ASTM standard.

What is the difference between SA 516 GR 70 and SA 387 GR 11?

Compared to carbon steel plates, SA 387 Gr 11 plates offer superior corrosion and oxidation resistance while maintaining good tensile and yield strength. Compared to SA 516 Gr 70 plates, SA 387 Gr 11 plates have better resistance to oxidation and corrosion, making them a better choice for high-temperature environments.

What temperature is SA 387 GR 11?

In the lower end of the temperature range SA 387 Gr 11 (1150 °F min tempering temperature) , and SA 387 Gr 22 (1250 °F min tempering temperature) are used. These grades can be specified in either class 1 or 2 and can also be provided in the Normalized & Tempered or Quenched and Tempered.

GNEE Steel also supplies a variety of boilers and pressure vessel steel plates, such as A204 Grade B,A515 Grade 70,A537 Class 1,SA387 Grade 11 Class 1,P265GH,S537 Class 2,P355Q,P275N,P355N,P690Q,Q345R, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to alloy@gneesteelgroup.com. You are welcome to consult us, and we are very willing to answer your questions.