Description

Technical Parameters

Product Overview

SA588 Grade A Weather Resistant Steel Plate is a high-strength low-alloy structural steel plate manufactured according to ASTM A588 / A588M requirements. Designed for outdoor structures, it provides enhanced atmospheric corrosion resistance through controlled alloying elements such as copper, chromium, and nickel, which help form a stable protective patina layer on the steel surface.

Technical Specifications

ASME SA588 Grade A Chemical Composition

Grade	C%	Si%	Mn%	P%	S%	Cu%	V%	Cr%	Ni%
SA588 Grade A	0.19	0.30-0.65	0.8-1.25	0.050	0.040	0.25-0.40	0.02-0.10	0.4-0.65	≤ 0.40

ASME SA588 Grade A Mechanical Properties(For Plate Thickness ≤ 100mm / 4 in.)

Grade	Yield Strength	Tensile Strength	Elongation %
SA588 Grade A	≥345 MPa (50Ksi)	≥485 MPa (75Ksi)	21

Equivalent Standards

Standard	Grade / Specification	Note / Equivalence Level
ASTM / ASME	ASTM A588 Grade A / ASME SA588 Grade A	Base Standard
EN 10025-5 (European)	S355J2W / S355K2W	Equivalent Chemical & Mechanical Properties
JIS G3114 (Japanese)	SMA490AW / SMA490BW	Equivalent Structural Weathering Steel
ISO 4952	S355WR	International Standard Equivalent
Chinese GB/T Standard	Q355NH / Q355GNH	Domestic Equivalent Standard

Key Features

Chemical alloying with copper, chromium, and nickel forms a protective surface patina, helping to cut long-term maintenance and repainting costs.

A minimum yield strength of 345 MPa (50 ksi) enables lightweight structural designs without compromising load capacity.

Balanced carbon equivalent allows hassle-free field welding using standard SMAW, GMAW, or SAW processes.

Maintains structural toughness with optional Charpy V-Notch impact testing down to -40°C and Z-direction performance.

Supply Capability & Dimensions

Thickness: 6 mm – 100 mm (0.236 in. – 4.0 in.) (Thicker plates up to 200 mm available upon mill request)

Width: 1500 mm – 3200 mm (59 in. – 126 in.)

Length: 6000 mm – 12000 mm (Cut-to-length and custom geometry available)

Dimensional Tolerance: Fully compliant with ASTM A6 / A6M standard specifications

Surface Condition: As-rolled, Normalized, Shot Blasting (Sa 2.5), or Pre-patinated (accelerated rust reaction available upon request)

Processing Services

CNC Cutting: Oxy-fuel, plasma, and high-precision laser cutting to customer drawing specifications.

Edge Beveling & Forming: Pre-welding edge beveling, plate bending, and cold rolling.

Surface Pre-treatment: Shot blasting (Sa 2.5) and professional chemical pre-rusting service for fast patina activation.

Key Application Fields

Bridge Engineering: Highway bridge girders, overpasses, expansion joints, and structural piers where protective painting is impractical or dangerous to re-apply.

Architecture & Exterior Cladding: Building façades, rainscreens, landscape sculptures, and outdoor decorative structures seeking a distinctive rustic aesthetic.

Heavy Machinery & Industrial Equipment: Dust collectors, industrial hoppers, crane booms, bucket wheel excavators, and unpainted storage silos.

Infrastructure & Utilities: Highway sound barriers, transmission towers, and outdoor pedestrian walkways.

Quality Control & Compliance

Mill Test Certificate (MTC): Fully traceable EN 10204 3.1 or 3.2 certification supplied with every batch, showing complete heat analysis, mechanical values, and impact testing result.

Optional Testing Services:
Charpy V-Notch Impact Testing (at 0°, -20°, or -40°)
Ultrasonic Testing (UT) according to ASTM A435 / ASTM A578 (Level A, B, or C)
Through-Thickness Tension Testing (Z-Direction test: Z15, Z25, Z35)

Third-Party Inspection Support: Independent verification by international bodies such as SGS, Bureau Veritas (BV), TUV, or Intertek is fully welcomed prior to departure.

A588 GRA

Ocean Freight Packaging & Logistics

Standard Export Packaging: Plates are bound with high-tensile steel straps, fitted with heavy-duty edge corner guards, wrapped in moisture-proof synthetic film, and secured on seaworthy skids or timber dunnage.

Shipping Options: Support for both FCL (Full Container Load) via open-top/standard containers and Breakbulk / RORO vessels for oversized thick plates.

FAQ

Q: What is your typical lead time for international orders?

A: In-stock sizes ship within 7–10 days; custom mill production runs generally require 20–30 days.

Q: Do you support third-party inspections such as SGS or Bureau Veritas?

A: Yes, third-party chemical, mechanical, and dimensional inspections are fully supported prior to shipment.

Q: Are the plates shipped pre-rusted or with a raw mill finish?

A: Standard delivery is raw mill finish; chemical pre-rusting and surface shot-blasting are available upon request.

Q: How are the steel plates packaged for ocean freight?

A: Plates are secured with heavy-duty steel strapping, edge protectors, and waterproof wrapping on seaworthy skids.

Q: What is your Minimum Order Quantity (MOQ)?

A: Stock sizes have no minimum order limit; custom factory production starts at 3 to 5 metric tons per specification.

Q: What payment terms do you accept?

A: We support T/T (Telegraphic Transfer) and L/C (Letter of Credit) at sight for international orders.

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