What is this material? 3

[harsuda]

Dear All,

I have analysed a steel material and found the following chemistry. Can any body help me in identifying this steel?

C: 0.17
Si: 0.05
Mn:0.86
S:0.004
P:0.014
Ni:0.12
Cr:0.11
Mo:0.04
V:0.003
Cu:0.39

Your help is highly appreciable.

 

[metengr]

This would appear to fit the designation of a low carbon, 1018 steel (G10180). In accordance with the Classification of Steel (ASM HB Vol 1), a carbon steel would contain no minimum specified alloy content (like Cr, Ni, Mo, Nb,W, V,,,) that is added to effect properties, and the max Cu content is 0.60%. The V in this steel is below the min required for low alloy steel.

What is the product form?

 

[arunmrao]

The Si is very low. This is intriguing? Or else as you say it is just 1018 steels with the other alloying elements being considered as tramp.

An interesting aside to the tramp elements specs. Recently I supplied a low alloy casting to a customer as per his specs,but he insisted that I had not delivered the correct material. I was surprised. On meeting the head QC I understood that they were also looking at maximum tramp elements allowed list and wanted me to incorporate these to the last decimal point.

 

[stanweld]

It could also be semikilled, A-36 or equivalent grade. The copper content is somewhat high and may have been intentionally added [for increased corrosion resistance] - or not.

 

[iceclass1994]

Hi,

Need to some more details to try to help you because
I personally don't like Si (too little) and Cu (too much) content.

1. Product type (rolled or forged) including shape, size, intended or actual application, heat treatment condition if any etc.
2. Al, Ti, Nb content if possible to be able to recognize grain refining practice applied,
3. The geographical area in which you have found such a chemical composition. Is it Europe? Is this grade of steel subject to the requirements of any ship classification society?

Regards,
iceclass1994

 

[harsuda]

Dear iceclass1994,

Component looks like made by pressing (shearing a sheet)an as rolled sheet. Looks like not heat treated as the hardness was only 90HRB. Used as hand tool in mining applications for clamping and unclamping threads of a pipe.

Al: 0.023, Ti: 0.006, Nb: 0.001

This is a part of hand tool used as wrench and made some where in Germany and used in Australia.

Regards,

 

[iceclass1994]

Dear Harsuda,

Please forgive my late reply. Having reviewed number of specifications and standards I came to the conclusion that we can not expect anything more than ordinary carbon-manganese steel for structural purposes which means (considering its German origin) in practice grade S235 (notch toughness unknown) acc. to EN-10025 or RSt37-2 acc. to the old German standard DIN 17-100.
For safety reasons do not expect mechanical properties higher than:
Re: 215-235 MPa providing that the nominal thickness of the product is below 100mm,
Rm: 340-470MPa providing that the product thickness is between 3 and 100 mmm,
Elongation A5 more than 22% (exact value also depending on the product thickness).
Justification is given below:
1. Si content 0.05 (please check again if it is not an error- everything would be clear if it is 0.50) shows a very poor deoxidation practice used usually for rimmed steel unless steel scrap was used for steelmaking process,
2. Al content itself and combination of other grain refining elements such as Nb+Ti+V show that Al grain refining practice was rather applied what proves wasting money by steelmaker considering a very low Si content,
3. a relatively high content of Cr, Ni and especially Cu might be not intended (tramps, as mentioned previuosly by our colleagues)and from my point of view was an objective evidence of poor scrap control (assuming the scrap was used for making this particular heat).
4. the carbon equivalent is about 0.38 (calculation made acc. to the requirements of the classification societies of ships) which shows relatively good but not excellent steel weldability.

A relatively high content of Cu might have been added, as mentioned previously by our colleagues, for improving corrosion resistance (impact of salt water) but please be careful and do not agree for suggested Re value of 355MPa although P and S content look relatively good. This steel may be something like a glass !!!
I would like to emphasize again that I am very concerned about Si content (too low) !!! ]

Best regards,
iceclass1994

 

[kenvlach]

Hi harsuda,
Considering the steel's German origins, iceclass1994 may be right about the grade. But, the composition is similar to some HSLA steels; only the low [Si] seems anomalous. See below:
ASTM A633 HSLA Steel Grade D, Thickness < 40 mm (1.5 in.)

Component Wt. %
ASTM measured
C Max 0.20 0.17
P Max 0.035 0.014
S Max 0.04 0.004
Si 0.15-0.50 0.05 (low)
Cr Max 0.25 0.11
Cu Max 0.35 0.39 (sl. high)
Mn 0.70-1.35 0.86
Mo Max 0.08 0.04
Ni Max 0.25 0.12

For the ASTM material in normalized condition:
YS 50 ksi [345 MPa],
TS 70-90 ksi [485-620 MPa],
elongation in 2 inches: 23% min.

You gave hardness as 90HRB. To get a tensile strength from this, I first converted to Vickers Hardness (HV) using ASTM E140: 90HRB = 185 Vickers (HV). Then
3.1 x HV ~ TS, MPa*
= 573 MPa, consistent with the ASTM range.

*HV hardness to TS conversion from

http://www.wtia.com.au/pdf/TGN-PE-01 Hardness testing of Welds.pdf

Note: MatWeb has properties for somewhat thicker section, < 65 mm [2.5 inch]

http://www.matweb.com/search/SpecificMaterial.asp?bassnum=MSA633D1