Hello There!

Golden Steel Material is a premier ISO-certified stockist based in Al Jubail. We supply high-performance pipes, fittings, valves, and flanges to the Oil & Gas and Industrial sectors across Saudi Arabia and the GCC.

Contact Us

Call Us

+966 54 662 1439
Send Email

info@gtesaudi.com
Location

Al Jubail 35526, Saudi Arabia

Reach Us

Welcome to Golden Steel Material Let’s Talk

info@gtesaudi.com
+966 54 662 1439
Al Jubail 35526, Saudi Arabia

SA 387 GR.11 CL.1/2 Plates

Material Grade: ASME SA387 Grade 11 (Class 1 & 2)

Alloy System: 1.25% Chromium - 0.5% Molybdenum

Service Focus: Intermediate High-Temperature Service

Operational Edge: Resistant to Embrittlement & Thermal Fatigue

Design Flexibility: Available in Two Tensile Strength Classes

Process Benefit: Excellent Ductility & Toughness Properties

Thickness Range: 6.0 mm to 150 mm

Primary Industries: Refining, Chemical Processing, & Boilers

goldenislands.com.sa

ASME SA387 Grade 11 Plates are high-quality Chromium-Molybdenum alloy steel plates, commonly referred to as 1.25Cr-0.5Mo. This specific grade is a foundational material for the petrochemical and power generation sectors, engineered to bridge the gap between carbon steel and high-alloy materials. The addition of 1.25% Chromium provides essential resistance to oxidation and chemical corrosion at intermediate temperatures, while the 0.5% Molybdenum ensures the material maintains its structural strength and resists thermal creep during long-term service in industrial boilers and pressure vessels.

These plates are available in two distinct heat-treated levels: Class 1 and Class 2. While Class 1 offers superior ductility for complex fabrication, Class 2 is optimized for higher tensile and yield strength, allowing for thinner wall designs in high-pressure environments. SA387 Grade 11 is particularly valued for its resistance to hydrogen embrittlement and its ability to withstand thermal fatigue, making it the industry standard for heat exchangers, process separators, and reactor shells. Its excellent weldability and reliable performance under pressure make it an indispensable choice for infrastructure operating in aggressive, heat-intensive environments.

SA 387 GR.11 CL.1/2 Plates Features

» Optimal 1.25Cr-0.5Mo Composition: Precisely alloyed to provide the ideal balance of high-temperature strength and corrosion resistance for intermediate service environments.
» Superior Creep Resistance: Molybdenum content ensures the material resists slow deformation under sustained thermal loads, maintaining the structural geometry of pressure vessels.
» Enhanced Oxidation Resistance: The Chromium addition protects the plate against scaling and surface degradation in oxidizing atmospheres and high-heat process streams.
» High-Temperature Toughness: Maintains excellent impact resistance and toughness even at elevated temperatures, reducing the risk of brittle failure in critical infrastructure.
» Hydrogen Embrittlement Defense: Formulated to resist the damaging effects of hydrogen in refinery service, making it suitable for hydro-treating and hydro-cracking applications.
» Dual-Class Strength Options: Offered in Class 1 for maximum ductility during cold forming and Class 2 for higher allowable design stresses in high-pressure vessels.
» Excellent Weldability: Designed for seamless integration into complex industrial assemblies, compatible with standard welding procedures following appropriate pre-heat protocols.
» Thermal Fatigue Resistance: Capable of withstanding the stresses of cyclic heating and cooling, which is essential for the longevity of steam boilers and reaction towers.

SA 387 GR.11 CL.1/2 Plates Specification

Standards

ASME Standard: SA387
ASTM Standard: A387
Grade: Grade 11
UNS Number: K11789

Chemistry

Chromium (Cr): 1.00% – 1.50%
Molybdenum (Mo): 0.45% – 0.65%
Carbon (C): 0.15% Max (Cl.1) / 0.17% (Cl.2)
Silicon (Si): 0.50% – 0.80%

Strength Class

Class 1 Tensile: 415 – 585 MPa
Class 2 Tensile: 515 – 690 MPa
Class 1 Yield: 240 MPa (Min)
Class 2 Yield: 310 MPa (Min)

Thermal State

Supply State: Normalized & Tempered
Optional State: Annealed
PWHT: Typically Required
Service Temp: Up to 550°C

Size Range

Thickness: 6 mm to 150 mm
Width: 2000 mm to 3000 mm
Length: 6000 mm to 12000 mm
Edge Finish: Flame Cut / Mill Edge

Quality Control

Certification: EN 10204 3.1 / 3.2 IBR
NDT: Ultrasonic Tested (UT)
Compliance: NACE MR0175 / MR0103
Testing: HIC, SSC, & Charpy-V Impact

SA 387 GR.11 CL.1/2 Plates Detailed Specifications

Property	Specification
Grade	ASME SA 387 GR.11 CL.1/2 Alloy Steel Plate
Width	1000mm-4500mm
Thickness	5mm-150mm
Length	3000mm-18000mm
Supply Condition	As Rolled, Normalized Rolling, Furnace Normalizing, Vacuum Degassing, Simulated Post-Weld Heat Treatment or as per customer requirement.
Impact tested	52° C
Process of Manufacturing	Hot-Rolled (HR)

SA 387 GR.11 CL.1/2 Plates Chemical Composition

C	Mn	P	S	Si	Cr	Mo
0.04 - 0.17	0.35 - 0.73	0.035	0.035	x 0.44 - 0.86	0.94 - 1.56	0.40 - 0.7

SA 387 GR.11 CL.1/2 Plates Mechanical Properties

A387 / SA387 Grade 11	Class 1	Class 2
Tensile Strength (ksi)	60-85	70-90
Tensile Strength (MPa)	415-585	485-620
Yield Strength (ksi)	35	45
Yield Strength (MPa)	240	310
Elongation in 50mm (%)	19	18
Elongation in 50mm (%)	22	22

SA 387 GR.11 CL.1/2 Plates Equivalent Grades

BS	EN	ASTM/ASME	DIN
621 B	-	SA387-11-2	-

Industrial Locations & Keywords

Industrial Locations & Keywords
Riyadh Industrial Cities (1st, 2nd, 3rd & Sudair)
Jeddah Industrial Cities (1st, 2nd & 3rd)
Dammam Industrial Areas (1st, 2nd & 3rd)
Jubail Industrial City
Yanbu Industrial City
Rabigh Industrial City
Al Khobar Industrial Area
Al Ahsa Industrial City
Madinah Industrial City
Makkah Industrial City
Taif Industrial City
Tabuk Industrial City
Jazan Industrial City
Industrial supplier in Saudi Arabia
Pipe fittings supplier in Jubail / Dammam / Riyadh
Flange and valve supplier Saudi Arabia
Fast delivery industrial materials KSA