ASTM A572 Grade 42  Specifications
A572/A 572M - 07

ASTM A572 / A 572M - 07 covers the standard requirements for Grades 42, 50, 55, 60, and 65 for high-strength low-alloy columbium-vanadium structural steel shapes, plates, sheet piling, and bars for applications in bolted riveted, and welded structures in bridges and in buildings. The steel shall be semi-killed or killed. Precision Grinding purchases steel plate from well-known manufacturers from across the world.  The use of columbium, vanadium, titanium, nitrogen, or combinations thereof shall meet the requirements of those producers and these specifications. A572 Gr. 50 and Gr. 42 steel plates and shapes from Precision Grinding, Inc. meet these specifications. Please, visit www.astm.org for a complete list of specifications for ASTM grades of plate.

Of interest to note from ASTM specifications: The min. yield points covered by Grades 42 [290], 50 [345] and 60 [415]  are the yield strengths most closely approximating a geometric progression pattern between those min. yield points between 36ksi, ASTM A36 [250MPa] and 100ksi, ASTM A514 [690 MPa].

A572 Gr. 50 Steel Plate Available from Precision Grinding - Custom Steel Parts

Grade Fractional Inches Decimal   ASTM Steel thickness thickness           A572-50 1/2" 0.5" Precision Grinding, Inc. is your  A572-50 5/8" 0.625" ONE-STOP SHOP  A572-50 3/4" .75" for Custom Steel Parts.  A572-50 1" 1.0"   A572-50 1 1/8" 1.125" Large Inventory A36, A572 Plate, A516, A514-T1,   A572-50 1 1/4" 1.25" 1020, 1045, 4140, and other hot roll plate  A572-50 1 3/8" 1.375" on-site, inside our 60,000 square foot plant.  A572-50 1 1/2" 1.5"   A572-50 1 5/8" 1.625" We take pride in pulling plate from inventory, A572-50 1 3/4" 1.75"   A572-50 2" 2.0" Flame cutting and Plasma cutting to size, A572-50 2 1/4" 2.25" Blanchard and Surface Grinding to thickness, A572-50 2 1/2" 2.5" Machining and Milling to engineered specs,  A572-50 2 3/4" 2.75" and Fabricating Weldments A572-50 3" 3.0" to your custom order.  A572-50 3 1/4" 3.25" A572-50 3 1/2" 3.5" Please, call us at 1.888.934-7463 (toll free)  A572-50 3 3/4" 3.75" with your next steel plate request.  A572-50 4" 4.0" A572-42 4 1/4" 4.25" Call for A572 Gr. 42 Inventory Stock Request A572-42 4 1/2" 4.5" Paint Identification Colors, though no longer A572-42 5" 5.0" part of specifications, are sometimes still in use. A572-42 5 1/4" 5.25"   A572-42 5 1/2" 5.5" A572 Steel Plate Grade 50,  Green & Yellow A572-42 6" 6.0" A572 Grade 42, White & Green

ASTM A572 Grade 50 Inventory on Shelf Plates Cut to size Grinding / Machining Large CNCMachining

Other common, similar HSLA chemistry plates include AISI 1018 and ASTM A588.  1018 steel is a carbon/manganese based specification that precludes the addition of columbium and vanadium. Higher yield strength grades with minimum yields from 45 ksi - 70 ksi  may be specified as 1018 HSLAS. A588 is normally specified when greater corrosion resistance properties are required. ASTM A588/A 588M specifications cover up to 8 inches thick. Specification A588 should not be substituted for A572 without agreement between parties. 

http://www.ul.ie/~childsp/CinA/Issue65/TOC43_Columbian.htm very interesting article about Columbium

http://minerals.usgs.gov/minerals/pubs/commodity/niobium/ world facts about Columbium

http://en.wikipedia.org/wiki/Vanadium wiki Vanadium article