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Please help me understand this section clearly : Under section 2.4.1 for manufacturing 410SS or CA15, the heat treatment called out is a double temper after austenitizing. However for the same alloy after welding under section 2.4.3 the standard indicates a single temper only. ALso, the...

What is the recommended heat treatment for ASTM A352 Grade LCB Steel to meet the impact testing requirements? So far I have tried a few heat treatment cycles. Normalized at 1625F and tempered at 1125. Double Normalized at 1625F and tempered at 1125F, water quenched from 1625F and tempered at...

thread330-217250 The above thread references Nitrogen solubility in CA6NM. We are having porosity issues in casting with thinner walls (0.5"). I am having our heat tested for nitrogen content. In the mean time can any one comment about what percentage of Nitrogen would cause porosity in CA6Nm...

Has any one done any studies or know references pointing to which form of manganese is more effective in de-oxidation of steel melts? (ferro Manganese or pure electrolytic manganese) -------------------------------------- There is always some thing better out there... Mahadhatu

We make and test replacement pumps for the petrochemical industry. As a part of the testing process, we have to hydrostatic pressure test each pump case. I am looking for wetting agent or surfactants that you add to the water when pressure testing to enhance the properties of water. Does any...

We make and test replacement pumps for the petrochemical industry. As a part of the testing process, we have to hydrostatic pressure test each pump case. I am looking for wetting agent or surfactants that you add to the water when pressure testing to enhance the properties of water. Does any...

Has any one heard of nickel 200 coating on aluminum castings? We have a customer who wants to know if Ni-Al-Bronze can be coated with Ni-200. Please comment Thank you -------------------------------------- There is always some thing better out there... Mahadhatu

I am working with a customer who is looking for a material to use for a pump pumping high concentration of H2S (above 50000ppm)at room temperature. I have looked at NACE but NACE addresses mostly downhole and compressor application and talks about partial pressure limits for various alloys for...

I am trying to find a reference mentioning effectiveness of using 410 steel in ethane/propane application. The composition is 80% propane:20% ethane. I found one place which mentions the use od brass, cast iron or cast steel. What other alloys are better suited for this application?. Any...

I am trying to determine the end of life for some CA6NM pumps in H2SO4 service. We have repaired these pumps numerous times. I am looking for ways to tell when the pumps cannot be repaired any more. Thanks for your comments. -------------------------------------- There is always some thing...

What effect does Aluminum have on the properties of 83-7-7-3 ( SAE 660 Bronze)? I am having difficulty attaining mechanical properties for a heat. I have about 0.2% Aluminum in the composition and max allowable is 0.005%. Thanks -------------------------------------- There is always some...

I am having difficulty hardening a CA15 casting. The chemistry is within the ASTM spec including the trace elements. The heat treatment I have been running has worked on different lots with similar composition. 1850F - 3h Fan cool usually results in close to 400BHN hardness. On this lot the...

Gurus , My attempts to locate a filler metal to weld ASTM A743 CA6N have failed. If any one you have an idea about this please reply. I think the strength levels this grade at room temperature are excessively high for the 410NiMo electrodes. Please post your comments if you have tried using the...

I am looking for corrosion data for Stellite #6 against Nitric Acid. I am interested in knowing the corrosion rates at various concentrations and if possible temperatures. Is this data available freely? if not, where can i buy it from? Thank you, Mahadhatu

Dear Guru's Does any one have an idea about a 20Ni-9Cr-0.2C-0.7Mn-1.0Si alloy? Is there a specification which covers this alloy?

Dear Gurus, I have been trying to find out what is 304D type stainless steel. We have a customer who has specifically mentioned that they do not want a 304D type SS for their part. Can some one throw some light on this? Thank you, Mahadhatu.

I have discovered that low carbon steels pickup a lot of carbon some times in the range of 100% while heat treating these steels in a natural gas fired furnaces. I noticed this carbon pickup in steels containing less than 0.03% carbon. It appears that the part less than 3" thick gets fully...

Dear Gurus I am trying to set a PQR for CD4MCU duplex stainless steel casting. After welding, the ASTM standard was followed for PHWT which is, stabilising at 2050F for 1in/hr and 2h min and then furnace cooling to 1900F, stabilising at 1900F and quenching in agitated water. I came up with an...

While reading some specifications for Duplex Stainless Steel Castings and Forgings, I came accross the term "U-Factor". It says here that this factor is dependent on the weight percentage of Si, Cr and Mo. Can somebody help me understand the significance of this factor and where else...