ASTM A588 Grade C Steel Plate | A588 Gr.C Weathering Steel supplier

ASTM A588 Grade C, also searched as A588 Gr.C, A588GRC, A588-C, A588 Gr C, ASTM A588 Gr.C and A588 Grade C 50ksi, is a historical grade from older editions of ASTM A588/A588M. Current A588/A588M lists Grade A, Grade B and Grade K only. Grade C still appears on drawings, stock lists and Google searches, so this page keeps the old chemistry and the 50 ksi table. Do not order Grade C as if it were still in Table 1 of the latest book without naming the edition.

A588 covers high-strength low-alloy structural steel plates, shapes and bars with atmospheric corrosion resistance for welded, riveted or bolted construction. The main use is welded bridges and buildings where weight saving or unpainted durability matters.

Grade C used a leaner carbon window and a required nickel range. Grade A and Grade B remain the current vanadium grades. Grade K is the current niobium grade. Mechanical properties on historical Grade C follow the same thickness table as A / B / K. Do not treat A588 as ASTM A572 Grade 50 unless the file does not need weathering. Do not treat A588 as ASTM A36. Do not treat A588 as a pressure-vessel plate. That work sits on ASTM A516 or pressure vessel steel plates.

Buyers also type Corten A, Corten B and A242. Corten A and Corten B are trademark names. ASTM A242 is a different weathering book. Dual mark only when both chemistries and both mechanical tables are met. European comparisons are EN 10025-5 S355J2W and EN 10025-5 S355K2W.

Historical Grade C still forms a patina in wet-dry outdoor air. The book year on the purchase order decides whether the mill can stamp Grade C or must offer current Grade A / B / K as a substitute. Indoor wet service, standing water and marine splash still need coating review. Weathering steel is not stainless steel.

General requirements follow A6/A6M. Steel is produced to fine-grain practice. Thickness in the family goes to 8 in / 200 mm. To 100 mm the minimum yield is 50 ksi / 345 MPa and the minimum tensile is 70 ksi / 485 MPa. Over 100 mm the yield name drops. Density is 7.85 g/cm³.

SHH STEEL is a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin). We source A588 Gr.C against the named book year, or we quote current Grade A / B / K when Grade C is no longer in the mill’s Table 1. Heat and product analysis are printed when ordered.

Related category pages: weathering steel plates, structural steel plates, EN 10025-5 and high strength low alloy plates.

Nearby pages that buyers compare, but must not swap blindly, include Corten A, Corten B, EN 10025-5 S355J2W and A572 Gr.50.

Historical Grade C used a lean carbon window and a required nickel range. Heat analysis is the mill table from older A588 editions. Product analysis, when ordered, follows A6 product tolerances on that heat.

Heat Analysis and Product Analysis — ASTM A588 Grade C (historical)

Current Grade A uses 0.19% max carbon, 0.40–0.65% chromium and no mandatory nickel minimum. Current Grade B uses 0.20% max carbon. Current Grade K uses niobium instead of a vanadium minimum. If the purchase order writes product analysis, SHH STEEL prints both columns. Always name the A588 year on the PO.

Do not treat this chemistry as A572 Gr.50. A572-50 has no mandatory Cu-Cr-Ni weathering window. Do not treat it as S355JR. S355JR is ordinary structural steel.

Buyers search A588 Gr.C mechanical properties, A588GRC yield, A588 Grade C 50ksi and A588-C tensile.

Tensile Properties — A588 plates and bars (same thickness idea as current grades)

The grade letter does not change the yield name. Confirm the edition on the order. Impact is not automatic. Bridge work that needs Charpy values must write temperature, joules and orientation. A709 Grade 50W is the bridge-book twin when the file is an AASHTO bridge.

Density is 7.85 g/cm³. Typical hardness after rolling sits around 130–180 HBW.

There is no official current twin for A588 Gr.C because the grade is not in the latest Table 1. What buyers compare is a 345 MPa weathering plate with Cu-Cr-Ni-V.

In the United States the current sisters are A588 Grade A, Grade B and Grade K. Bridge files often rewrite weathering chemistry as A709 Grade 50W. Corten A and Corten B are trademark names.

In Europe compare S355J2W, S355K2W and S355J0W. Phosphorus weathering grades S355J0WP and S355J2WP are a different chemistry family. See EN 10025-5 and weathering steel plates.

In China compare GB/T 4171 Q355GNH or Q355NH. Dual mark only when both books are fully met.

Buyers pick A588 Gr.C when an old drawing still names Grade C. Search phrases such as A588GRC, A588 Grade C, A588-C and A588 Gr C 50ksi all point here. SHH STEEL will ask for the book year before rolling.

It is the wrong plate for a pressure vessel. That work is A516 Grade 70 or the ASME SA662 family. It is the wrong plate for a painted 50 ksi building that does not need copper and chromium. That work is A572 Gr.50. It is the wrong plate for stainless cladding. That work sits on stainless steel sheets and plates.

Unpainted A588 needs wet-dry cycles. Standing water, buried faces and constant spray do not form a stable film.

ASTM A588 Grade C is weldable HSLA plate. Treat welding as structural production welding, not as ordinary A36 shop practice.

Typical consumables are matching weathering wires or E8018-C3 / E80C-G type electrodes qualified on a 50 ksi weathering family. A procedure written for current Grade A or Grade B is usually the starting point after the WPS heat range is checked. A procedure written for A572 Gr.50 may miss the copper and chromium effect on the HAZ color. A procedure written for S355JR is not a weathering procedure.

Preheat follows thickness and hydrogen control. After heavy cold forming, a stress relief may be required. The fabricator owns the WPS. SHH STEEL can share mill heat data, product analysis, CEV and the G101 index for that review.

Usual delivery from SHH STEEL for A588 Gr.C is as-rolled or normalized when the mill route or the purchase order asks for it.

A588 is not a QT vessel book. Do not order it as SA517 or A514. Normalizing, when used, is typically 880–920 °C, soaked through, then air cooled. Fine-grain practice is part of manufacture.

The certificate lists ASTM A588 Grade C and the book year; or it lists the agreed current substitute (Grade A / B / K). Heat analysis and product analysis print when ordered. Certificates may be EN 10204 3.1 or EN 10204 3.2.

Usual supply range from SHH STEEL for A588 Gr.C weathering steel plate:

• Thickness: commonly 6 mm – 100 mm, heavier plate to 200 mm by enquiry
• Width: 1500 mm – 4000 mm
• Length: 3000 mm – 12000 mm

Cut-to-size girders, flanges and facade panels are available. Browse more sizes on weathering steel plates, structural steel plates and the products index.

Dimensional limits for ASTM A588 Grade C follow A6 / A6M unless the purchase order names another table.

Typical A6 thickness tolerance idea for A588 Gr.C

Width on 1500–4000 mm plate is commonly held to about ±20–25 mm unless a tighter extra is named. Length on 3000–12000 mm plate is commonly held to about +50 / 0 mm or ±25 mm by mill practice. Flatness follows A6 unless a tighter class is written. SHH STEEL will not assume a zero-minus extra on A588GRC unless the order says so.

Historical Grade C already defines chemistry and the 50 ksi table to 100 mm. Extra items still have to be written on the purchase order.

Book year. Write the A588 edition. If the mill cannot stamp Grade C, write the accepted current substitute.

Impact details. Write temperature, joules, location and orientation.

Product analysis. Write it if the file needs the second chemistry column.

G101 index. Write it if the owner wants the corrosion index on the certificate.

Through-thickness / Z-test. When needed on thick flanges.

NDE. UT to the named class.

Shot blast and primer. Only when the plate will not stay bare.

Identification and stamping. Heat number, A588 Grade C or the agreed substitute, thickness and mill logo.

Third-party witness. EN 10204 3.2 with SGS, TÜV, BV, ABS or the inspector named.

A588 Grade C is the plate for a file that still names the old grade. New work should use current Grade A, B or K. It is the wrong plate for a painted warehouse that can use A36 or S355JR. It is the wrong plate for a QT 100 ksi member. That work sits on A514 Grade Q.

SHH STEEL sources ASTM A588 Grade C against the named book year, or quotes current Grade A / B / K as a documented substitute. Partner mills include Wuyang (Wugang), Angang, Shougang, Hanye, Anyang Iron & Steel, Baosteel, Xinyu, Xingcheng, TISCO (Taiyuan), Jiuquan (JISCO) and other qualified mills when the size requires it.

Mill test certificates are issued to EN 10204 3.1 as standard. EN 10204 3.2 is arranged when the order names a third-party hold point. Dual marking to A709 Grade 50W or GB/T 4171 Q355GNH is available only when both books are met.

Usual stock and rolling thickness: 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 30 mm, 32 mm, 40 mm, 50 mm, 60 mm, 80 mm, 100 mm.

Processing: CNC or flame cutting, bevel, flattening, shot blast, UT to the named class.

Trade terms: FOB Shanghai main, CIF destination available. Payment: TT, LC, or TT + LC.

Ocean time from Shanghai: US West 14–18 days; US Gulf 28–35 days; Rotterdam / Antwerp 28–35 days; Jebel Ali 18–25 days; Singapore 7–12 days; other ports quoted.

Third-party: SGS, TÜV, BV, ABS, CCS, GL, VL, DNV, RINA, NK, KR, or the inspector named.

SHH STEEL is a global steel mill sourcing partner with mill partnerships in China. We supply ASTM, ASME, EN, DIN, JIS and GB steel to buyers in the United States, Europe, the Middle East, Southeast Asia, Africa and South America. Origin is mill-direct, China origin.

SHH STEEL has supplied steel plates to the USA, Mexico, Argentina, Peru, El Salvador, Spain, Netherlands, Germany, UAE, Saudi Arabia, South Africa, India, Thailand, Singapore, Vietnam, the Philippines, Japan and Korea.

Typical lead time: ex-stock 5–7 days; standard rolling about 30–45 days; normalized or 3.2 inspection about 45–60 days.

Experience on this grade is simple: say that Grade C is historical, print the book year, and do not silently stamp current Grade A as Grade C. SHH STEEL as a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) will not hide the edition change, will not drop nickel from a Grade C chemistry window, and will not treat A588 as A36.

We keep the book on the order. A588GRC is not A572 Gr.50. A588 Grade C is not Corten A unless the trademark chemistry is also met. A588 Grade C is not S355J2W unless both books are on the certificate. If the mill cannot roll Grade C, we will offer current Grade A, B or K in writing.

ASTM A588 Grade C Steel Plate is a historical 50 ksi weathering grade from older A588 editions, with 345 MPa yield to 100 mm and Cu-Cr-Ni-V chemistry. Whether the inquiry says ASTM A588 Grade C, A588 Gr.C, A588GRC, A588-C, A588 Gr C or A588 Grade C 50ksi, SHH STEEL as a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) supplies plate to the named book year, or quotes current Grade A / B / K, with heat and product analysis as ordered and EN 10204 3.1 or 3.2 certification.

SHH STEEL supplies ASTM A588 Grade C / A588 Gr.C Weathering Steel to the United States, Europe, the Middle East, Africa, Asia and the Americas for work that still names this historical grade.

Contact SHH STEEL for mill rolling, book-year confirmation, current-grade substitution, cutting, blast, 3.2 inspection or a worldwide quotation.

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