HARDNESS FROM CHEMISTRIES?

[AMTUBER]

WE ARE USING LOW CARBON STEEL TO MAKE TUBING. WE RECEIVE CHEMISTRIES BEFORE WE RECEIVE THE STEEL ITSELF FOR HARDNESS TESTING. IS THERE A WAY OR FORMULA THAT WE COULD FIGURE A BALLPARK HARDNESS BY USING CARBON, MANGANESE, PHOSPHORUS, SULFUR, AND SILICONE? SOME EVEN GIVE VANADIUM AND CHROMIUM LEVELS.

 

[Goahead]

Hardness strongly depends on microstructure, that depends on chemistry, on rolling procedures but mostly on heat treatment. Composition cannot give a clue on hardness.
Could you ask the supplier to fax you hardness results?

http://www.welding-advisers.com/

 

[kenvlach]

Your purchase order should be more specific.
E.g., 1008 steel, DQ (drawing quality), annealed, pickled & oiled.

 

[AMTUBER]

I SHOULD SPECIFY THAT WE ARE BUYING STEEL THAT HAS ALREADY BEEN ROLLED AND ONLY HAS 2 DESIGNATIONS EITHER HRHS (HOT ROLL HIGH STRENGTH) OR HRCQ (HOT ROLL CONSUMER QUALITY) WE GENERALLY BUY THE HIGH STRENGTH TO ROLL FOR THE ASTM A500 GRADE B, AND C (STRUCTURAL) AND THE CONSUMER QUALITY FOR ASTM A513 (MECHANICAL). WE FIND THAT THE CHEMISTRIED CAN BE SIMILAR BUT HARDNESS IS ALL OVER THE PLACE. THE ROLLING PROCEDURES AND HEAT TREATMENT MAKES SENSE AS WE DO GET STEEL FROM DIFFERENT MANUFACTURERS, DIFFERENT PROCESSESS AND COOLING PROCEDURES.