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Impact strength of 4130 materials

Impact strength of 4130 materials

Impact strength of 4130 materials

(OP)
How to achieve to 42 J at -42 C in 4130 Q&T.

Need advise

RE: Impact strength of 4130 materials

(OP)
How to achive yield strength of 85K , Tensile Strength of 105K and Impact of 42J average at -42 Deg c for 4130 Q& T materials.

Can we check the impact test in actual materials instead of QTC.

RE: Impact strength of 4130 materials

First, what is the section size or material thickness of the 4130 steel?
Second, are you intending to heat treat the 4130 steel after it has been received or did you have the 4130 supplied as quenched and tempered and it did not pass impact testing at -42 deg C?

RE: Impact strength of 4130 materials

As metengr has indicated, it would make it a lot easier if you would tell us what you are trying to do.

What product are you dealing with?
What is the QTC size?
How are you heat treating? What kind of quench?

Yes, you can meet those mechanical properties with 4130, but you have to have a high percentage martensite formed on quenching, and you have to keep the sulfur and phosphorus low.

rp

RE: Impact strength of 4130 materials

(OP)
Products is API 6A Flanges, Destructive test has been carriedout to verify on th finished flanges and found that impact is low. Hardness and Tesile exactly meet the requirements.

Can we check impact on actual parts.what is the better way to achieve impact of 42J at -42 deg by heattreatment.

RE: Impact strength of 4130 materials

It's been a while since I have read 6A, but I think that if you take test specimens from the actual product (as opposed to from a QTC), they must come from 1/4 T of the thickest section of the product and the specimens from all tests (tensile, impact, and hardness) must come from actual product. In addition, if you have a failed test result, there are specific retest procedures you must follow to qualify the lot, you can't just ignore the test results and keep testing until you find results you like.

Get a copy of the standard and read up on the requirements, I am pretty sure it tells you exactly what needs to be done (probably re-heat treating the lot).

rp

RE: Impact strength of 4130 materials

What tempering temperature did you use?

RE: Impact strength of 4130 materials

(OP)
Tempering Temperature 680Deg celcius with 7 hrs soaking time.

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