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

SA 387 GR.9 CL.1/2 Plates

Material Grade: ASME SA387 Grade 9 (Class 1 & 2)

Alloy System: 9% Chromium - 1% Molybdenum Steel

Thermal Specialty: Extreme Oxidation & High-Heat Resistance

Service Life: Enhanced Durability in Corrosive Gas Streams

Class Availability: Available in Class 1 & High-Strength Class 2

Metallurgical Edge: Optimized for Severe Creep Resistance

Thickness Range: 6.0 mm to 100 mm

Primary Industries: Power Generation, Nuclear, & Petrochemical

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ASME SA387 Grade 9 Plates are high-alloy Chromium-Molybdenum steel plates designed for exceptional performance in severe high-temperature environments. Containing a nominal 9% Chromium and 1% Molybdenum, this grade offers the highest level of corrosion and oxidation resistance within the standard SA387 series. These plates are engineered to maintain their mechanical integrity in the most demanding sections of power generation plants and petrochemical refineries, where equipment is subjected to aggressive chemical process streams and sustained thermal loads that would compromise lower-alloy materials.

The technical superiority of ASME SA387 Gr.9 is particularly evident in its resistance to steam oxidation and high-temperature sulfidation. Available in Class 1 and Class 2, it provides designers the choice between maximum ductility and enhanced tensile strength. Class 2, specifically, is heat-treated to provide higher allowable design stresses, making it ideal for high-pressure separators, heat exchangers, and reaction vessels. Its robust chemical profile makes it a preferred material for advanced boiler applications and nuclear power components. With precise control over metallurgical properties through normalizing and tempering, SA387 Grade 9 plates deliver long-term reliability and safety in critical infrastructure operations.

SA 387 GR.9 CL.1/2 Plates Features

» Superior 9Cr-1Mo Chemistry: Optimized with 9% Chromium and 1% Molybdenum to provide the highest level of oxidation and corrosion resistance in the Cr-Mo alloy family.
» Extreme High-Temperature Stability: Engineered to maintain high tensile strength and structural reliability at service temperatures far exceeding standard alloy grades.
» Excellent Oxidation Resistance: The high Chromium content creates a robust protective scale, making it ideal for use in high-pressure steam environments and industrial furnaces.
» High-Performance Creep Resistance: The 1% Molybdenum addition ensures maximum resistance to slow deformation (creep) under the extreme thermal stresses of power generation.
» Sulfidation and Hydrogen Defense: Highly resilient against high-temperature sulfidation and hydrogen attack, critical for equipment in advanced hydro-cracking and refinery units.
» Class-Specific Design Flexibility: Available in Class 1 for superior ductility and Class 2 for high-strength requirements in high-pressure reaction vessel designs.
» Refined Metallurgical Integrity: Supplied in the Normalized and Tempered condition to ensure a fine grain structure and uniform mechanical properties across the entire plate surface.
» Steam-Side Performance: Specifically favored for boiler tubing and headers due to its ability to resist the aggressive corrosive effects of high-velocity steam.

SA 387 GR.9 CL.1/2 Plates Specification

Standards

ASME Standard: SA387
ASTM Standard: A387
Grade: Grade 9
UNS Number: K90941

Chemistry

Chromium (Cr): 8.00% – 10.00%
Molybdenum (Mo): 0.90% – 1.10%
Carbon (C): 0.15% Max
Silicon (Si): 1.00% Max

Strength Class

Class 1 Tensile: 415 – 585 MPa
Class 2 Tensile: 515 – 690 MPa
Class 1 Yield: 205 MPa (Min)
Class 2 Yield: 310 MPa (Min)

Processing

State: Normalized & Tempered
Austenitizing Temp: 900°C – 950°C
Tempering Temp: 700°C Min
Weldability: Requires PWHT

Dimensions

Thickness: 6 mm to 100 mm
Width: 1500 mm to 3000 mm
Length: 6000 mm to 12000 mm
Edge Condition: Trimmed / Mill Edge

Quality Control

Cert: EN 10204 3.1 / 3.2 IBR
Tests: Tensile, Bend, & Charpy V
NDT: Ultrasonic Tested (UT)
Special: HIC / SSC / NACE Compliance

SA 387 GR.9 CL.1/2 Plates Detailed Specifications

Property	Specification
Item	ASME SA 387 GR.9 CL.1/2 Alloy Steel Plate
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.9 CL.1/2 Plates Chemical Composition

C	Mn	P	S	Si	Cr	Mo
0.15 max	0.25 - 0.66	0.030	0.030	01.05 max	7.9 - 10.1	0.85 1.15

SA 387 GR.9 CL.1/2 Plates Mechanical Properties

Property	Value
Grade	ASME SA 387 GR.9 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.9 CL.1/2 Plates Equivalent Grades

BS	EN	ASTM/ASME	DIN
-	-	SA387-9-2	-

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