Recent content by RAJMETALLURGY

What is the solution for the earlier thread "thread330-213484" regarding under riser crack in carbon steel. Please some one guide me.

Dear Sir, Still I can not solve this issue. Please give your suggestion. How to avoid boundary marking around the weld after DP testing? How to remove defect from casting?

Ok sir, I will try the weldability test as per A494-2017a S50. How to remove the defect from the casting. If we use carbon arc gouging, its getting stick on the casting and its very difficult for major repairs.

Sir, SMAW is our regular process. But we have tried in SMAW and GTAM but its not working. What is S22? its comes under which material spec, please clarify. We used ENiCu-7 & ERNiCu-7 We have removed the metal/defect by grinding and ensured the defect removal by Liquid Penetrant testing. No...

Sir, How to do welding on Monel Casting. Whenever we do welding (major or minor / spot weld) we end up with a boundary mark in Dye penetrant testing around the fusion line (base/weld interface, in HAZ). No defects were revealed in weld metal. But only a boundary is appearing in fusion line...

We have checked from the test bars after machining, and third party also witnessed and accepted the chemical results. But at customer end they checked on the casting and they found the variation.

@ HBmetals: can u please share the chemical composition.

Dear Sirs, My reported Aluminium level was 0.032% and we checked from the chemical specimen which was poured from the ladle with spectrometer. My customer requirement is 0.04% max. Its with in the required limit and we sent the casting. But my customer was checked the Aluminium level on the...

As per ASTM A352 for LCC material the mechanical properties are UTS: 485 - 655 MPa Ys: 275 MPa Min Impact: Average 20J @ -46 Deg C. Will it be the same after PWHT also. Please clarify.

Reheattreatment means, we have to do Normalizing, quenching , tempering & PWHT. please clarify.

Thanks for your reply, Is there any other way to improve the tensile and impact value to meet the requirements. And is it necessary to meet the material specifications after PWHT. Please advice.

Material: ASTM A352 LCB Test coupon: 80 mm thickness, Length: 250 mm, width: 125 mm Heat Treatment: Normalizing 930 Deg C, Quenching 910 Deg C, Tempering 650 Deg C Mechanical Property: Yield 341.77 MPa, UTS: 506.55 MPa, Impact average 30 Joules at -46 Deg C (required 27 joules). Simulated PWHT...

Tempering temperature range is given from our customer, the range is 620 - 680 Deg C. We have done some testing in lower side tempering temperature also but still its not working. Some of the heats have Aluminium less than 0.06% and that also getting fail. Soaking hrs is based on the thickness...

Failed Heat Passed Heat C 0.21 0.19 (0.23 Max) Mn 0.88 0.83 Si 0.44 0.51 P 0.025 0.027 S 0.012 0.012 Cu 0.02 0.02 Ni 0.36 0.24 Cr 0.13 0.1 Mo 0.01 0.01 V 0.001 0.001 N 0.015 0.01 Al 0.097...

Carbon & Carbon equivalents are within the specification Carbon: 0.21 % Carbon Equivalent : 0.40 I have lowered the tempering temeperature to increase the strength but still its not working. Pouring temperatures are similar and only slight variations observed. Tramp elements ? what kind of...