JIS G3101 SS490 Chemistry, Equivalency and Weldability 3

[rjsme]

I am evaluating JIS G3101 grade SS490 as a substitute for ASTM A36 as proposed by a potential supplier. I am interested in the chemical make-up and strength characteristics with my main processing concern being weldability. While it would seem that finding an equivalent for A36 should be simple, I have not dealt much with foreign steel equivalents before and am having difficulty with the information I am seeing.

I have bits and pieces of the JIS spec (as supplied by the vendor) that seems to point to ASTM A36 as a direct equivalent. I have attempted to find further information on this but there seems to be some inconsistencies. While some links/tables have pointed to A36, others have pointed to A572 gr. 50; A633 gr. A,C,D; A656 gr. 50. While I believe all of these to be readily welded, the inconsistency makes me uncomfortable.

Also, the JIS spec lists SS490 as having no maximum requirement for Carbon or Manganese. Am I reading this correctly? How can you NOT have a Carbon maximum requirement?

Is SS490 the correct material or is there a better Japanese equivalent?

Can someone please help me understand what I am looking at and provide some direction!

THANK YOU!

 

[metengr]

The equivalent to ASTM A36 is JIS G3101-SS400, not SS490. The 400 is a minimum tensile strength of 400 MPa. The SS490 equivalent is ASTM A572 Grade 50 (High Strength Low Alloy Columbium-Vanadium Structural Steel), which is high strength low alloy (microalloy) steel plate - weldable. I would go with the SS400, if you had specified A 36.

 

[rjsme]

metengr,

Thanks for the info! Can you recommend a good link or reference book for foreign metal equivalents?

 

[ijzer]

JIS G3101 does not specify C and Mn limits because it is rolled steel for general structure.
JIS G3106 is rolled steel for welded structure.This one has limits on C and Mn.

Many vendors use however G3101 for welded constuctions , but than they add limits on C and Mn content on the Mill Certificates

 

[TVP]

rjsme,

I highly recommend the two references mentioned in the following thread:

thread177-59325

 

[rjsme]

ijzer - Thanks for the info, I'll look into adding limits to the C and Mn.

TVP - Thanks for the recommendation. I had actually already ordered the Worldwide Guide to Equivalent Irons and Steels, but I feel better about spending the money now that I have a strong recommendation.