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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.

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+966 54 662 1439
Al Jubail 35526, Saudi Arabia

SA 387 GR.12 CL.1/2 Plates

Material Grade: ASME SA387 Grade 12 (Class 1 & 2)

Alloy System: 1% Chromium - 0.5% Molybdenum Steel

Service Application: Elevated Temperature Pressure Vessels

Performance Edge: Superior Resistance to Thermal Creep

Mechanical Choice: Available in Two Tensile Strength Classes

Fabrication Advantage: Excellent Formability & Weld Integrity

Thickness Range: 6.0 mm to 150 mm

Primary Industries: Oil Refineries, Petrochemicals, & Power Plants

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ASME SA387 Grade 12 Plates are high-performance Chromium-Molybdenum alloy steel plates engineered for weldable pressure vessels and industrial boilers operating at elevated temperatures. With a nominal composition of 1% Chromium and 0.5% Molybdenum, this grade offers a precise metallurgical balance designed to resist thermal degradation and oxidation. These plates are a staple in the petrochemical and oil refining industries, where they are utilized to fabricate equipment that must maintain structural integrity while subjected to the constant thermal stresses of high-heat process environments.

The technical utility of ASME SA387 Gr.12 is defined by its two strength levels: Class 1 and Class 2. Class 1 is typically chosen for applications requiring higher ductility and toughness, while Class 2 is heat-treated to provide increased tensile and yield strength, allowing for higher allowable design stresses in pressurized systems. Because of its controlled chemistry, Grade 12 provides excellent creep resistance and resistance to hydrogen attack, making it a reliable choice for heat exchangers, separators, and storage tanks. Its refined grain structure ensures that it remains easily fabricable and highly receptive to standard industrial welding processes, ensuring long-term safety in critical energy infrastructure.

SA 387 GR.12 CL.1/2 Plates Features

» Optimized 1Cr-0.5Mo Alloy: Engineered with 1% Chromium and 0.5% Molybdenum to provide essential high-temperature strength and oxidation resistance for pressurized equipment.
» Reliable Creep Resistance: The Molybdenum content enhances the steel's ability to resist slow deformation under sustained thermal stress, ensuring long-term structural stability.
» High-Temperature Toughness: Maintains excellent mechanical properties and impact toughness in elevated temperature environments, preventing brittle failure under operational loads.
» Hydrogen Attack Resistance: Specifically designed to resist hydrogen embrittlement and high-temperature hydrogen attack (HTHA), critical for refinery and petrochemical service.
» Versatile Strength Classes: Available in Class 1 for superior ductility and Class 2 for higher tensile and yield strength to meet diverse engineering design requirements.
» Excellent Weldability: The material is formulated for high-quality welding integrity, supporting the fabrication of complex pressure vessel shells and internal components.
» Consistent Thermal Expansion: Offers predictable thermal expansion coefficients, making it easier to design systems involving joined components of varying materials.
» Superior Surface Condition: Provided in a normalized and tempered state to ensure a uniform metallurgical structure and a surface receptive to industrial protective coatings.

SA 387 GR.12 CL.1/2 Plates Specification

Standards

ASME Standard: SA387
ASTM Standard: A387
Grade: Grade 12
UNS Number: K11562

Chemistry

Chromium (Cr): 0.80% – 1.25%
Molybdenum (Mo): 0.45% – 0.65%
Carbon (C): 0.17% Max
Manganese (Mn): 0.40% – 0.65%

Strength Class

Class 1 Tensile: 380 – 550 MPa
Class 2 Tensile: 450 – 585 MPa
Class 1 Yield: 230 MPa (Min)
Class 2 Yield: 275 MPa (Min)

Thermal Process

Condition: Normalized & Tempered
Alternative: Annealed
Fabrication: Hot/Cold Formable
PWHT: Stress Relieving Required

Dimensions

Thickness: 6 mm to 150 mm
Width: 1500 mm to 3000 mm
Length: 6000 mm to 12000 mm
Edge: Mill / Machine Cut

Quality Assurance

Cert: EN 10204 3.1 / 3.2 IBR
Tests: Tensile, Bend, & Impact
NDT: Ultrasonic (UT) Tested
Compliance: NACE MR0175 / HHTA

SA 387 GR.12 CL.1/2 Plates Detailed Specifications

Property	Specification
Grade	ASME SA 387 GR.12 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.12 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	0.13 - 0.45	0.74 - 1.21	0.4 - 0.65

SA 387 GR.12 CL.1/2 Plates Mechanical Properties

A387 / SA387 Grade 12	Class 1	Class 2
Tensile Strength (ksi)	50-80	65-85
Tensile Strength (MPa)	380-550	450-585
Yield Strength (ksi)	33	40
Yield Strength (MPa)	230	275
Elongation in 50mm (%)	18	19
Elongation in 50mm (%)	22	22

SA 387 GR.12 CL.1/2 Plates Equivalent Grades

BS	EN	ASTM/ASME	DIN
620 B	13 CRMO 45	SA387-12-2	13 CRMO 44

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