Bruno2 Posted March 11, 2018 Share Posted March 11, 2018 I am going to do some SS fasteners on this build. So far I plan to do the oil pan bolts, intake manifold, and possibly water pump ( it's a Windsor so the wp bolts are wonky lengths.) . Any more suggestions? PS, I will post lengths, diameters and thread pitch as I go for documentation purposes. Link to comment Share on other sites More sharing options...
Gary Lewis Posted March 11, 2018 Share Posted March 11, 2018 Exhaust manifold. Link to comment Share on other sites More sharing options...
Bruno2 Posted March 11, 2018 Author Share Posted March 11, 2018 Exhaust manifold. I need to come up with a plan for the ones that are studs... Link to comment Share on other sites More sharing options...
Bruno2 Posted March 11, 2018 Author Share Posted March 11, 2018 Exhaust manifold. Gary, I need to edit the title. How do I do that? It says AS instead of SS. My phone auto corrected it for me. Link to comment Share on other sites More sharing options...
Bruno2 Posted March 11, 2018 Author Share Posted March 11, 2018 I believe I have SS studs for the carb. I probably need to get some SS nuts and washers for them as well. Link to comment Share on other sites More sharing options...
85lebaront2 Posted March 11, 2018 Share Posted March 11, 2018 Gary, I need to edit the title. How do I do that? It says AS instead of SS. My phone auto corrected it for me. Don't use your damn phone or proof read before you send. On SS (technically CRES) you need to look at the strength, there are various grades of CRES. 304 CRES, comes as condition A or condition B, condition B is much stronger than condition A. Condition A is roughly like grade 2, condition B is somewhere between grade 5 and grade 8. CRES will also gall horribly, particularly condition A, you need a good anti-seize on them. 304, 304L (leaded) are primarily Chrome and Nickel, 316 and 316L also contain Molybdenum. and if I remember correctly are for higher temperature. I don't have access to all the specs right now like I did when I was still at NNS. I believe you can look up the ASTM specs on-line, or maybe in a library. Link to comment Share on other sites More sharing options...
Gary Lewis Posted March 12, 2018 Share Posted March 12, 2018 Gary, I need to edit the title. How do I do that? It says AS instead of SS. My phone auto corrected it for me. Edit your first post by clicking More/Edit Post in the upper right, and change the title. Link to comment Share on other sites More sharing options...
Bruno2 Posted March 12, 2018 Author Share Posted March 12, 2018 Edit your first post by clicking More/Edit Post in the upper right, and change the title. K Link to comment Share on other sites More sharing options...
85lebaront2 Posted March 12, 2018 Share Posted March 12, 2018 I need to come up with a plan for the ones that are studs... Brandon, you should be able to buy CRES allthread and make some, also look at Fastenal and even Gary's favorite, Amazon. Link to comment Share on other sites More sharing options...
Gary Lewis Posted March 12, 2018 Share Posted March 12, 2018 Brandon, you should be able to buy CRES allthread and make some, also look at Fastenal and even Gary's favorite, Amazon. Brandon called to ask what I know about stainless fasteners, which isn't much. My Carroll Smith Nuts, Bolts, Fasteners and Plumbing Handbook doesn't appear to say much about them. But my Pocket Reference by Thomas J. Glover says that both 18-8 and 316 stainless have 75,000 lb/sq inch minimum tensile strength. On-line I found that the Bolt Depot says this: Stainless Steel Stainless steel is an alloy of low carbon steel and chromium for enhanced corrosion characteristics. Stainless steel is highly corrosion resistant for the price. Because the anti-corrosive properties are inherent to the metal, it will not lose this resistance if scratched during installation or use. It is a common misconception that stainless steel is stronger than regular steel. In fact, due to their low carbon content, many stainless steel alloys cannot be hardened through heat treatment. Therefore, when compared to regular steel, the stainless alloys used in bolts are slightly stronger than an un-hardened (grade 2) steel but significantly weaker than hardened steel fasteners. Unless great care is taken, stainless fasteners are susceptible to seizing up during installation, a phenomenon known as galling. Most stainless steel fasteners are much less magnetic than regular steel fasteners though some grades will be slightly magnetic. 18-8 Stainless 18-8 refers to any stainless steel containing approximately 18% chromium and 8% nickel. This is the most common stainless designation for hardware. For information on 18-8 stainless steel material properties see our Material Grade Identification and Properties Chart. Stainless 316 A highly corrosion resistant grade of stainless steel. Ideal in salt water and chlorine environments. More expensive than 18-8. Stainless 410 A stainless alloy that is harder than 18-8 stainless steel, but not as resistant to corrosion. And Fastenal says this is their Technical Reference Guide on fasteners: Stainless Steel Stainless steel is a family of iron-based alloys that must contain at least 10.5% chromium. The presence of chromium creates an invisible surface film that resists oxidation and makes the material “passive” or corrosion resistant. Other elements, such as nickel or molybdenum are added to increase corrosion resistance, strength or heat resistance. Stainless steels can be simply and logically divided into three classes on the basis of their microstructure; austenitic, martensitic or ferritic. Each of these classes has specific properties and basic grade or “type.” Also, further alloy modifications can be made to alter the chemical composition to meet the needs of different corrosion conditions, temperature ranges, strength requirements, or to improve weldability, machinability, work hardening and formability. Austenitic stainless steels contain higher amounts of chromium and nickel than the other types. They are not hardenable by heat treatment and offer a high degree of corrosion resistance. Primarily, they are nonmagnetic; however, some parts may become slightly magnetic after cold working. The tensile strength of austenitic stainless steel varies from 75,000 to 105,000 psi. 18-8 Stainless steel is a type of austenitic stainless steel that contains approximately 18% chromium and 8% nickel. Grades of stainless steel in the 18-8 series include, but not limited to; 302, 303, 304 and XM7. Common austenitic stainless steel grades: • 302: General purpose stainless retains untarnished surface finish under most atmospheric conditions and offers high strength at reasonably elevated temperatures. Commonly used for wire products such as springs, screens, cables; common material for flat washers. • 302HQ: Extra copper reduces work hardening during cold forming. Commonly used for machine screws, metal screws and small nuts • 303: Contains small amounts of sulfur for improved machinability and is often used for custom-made nuts and bolts. • 304: Is a low carbon-higher chromium stainless steel with improved corrosion resistance when compared to 302. 304 is the most popular stainless for hex head cap screws. It is used for cold heading and often for hot heading of large diameter or long bolts. • 304L: Is a lower carbon content version of 304, and therefore contains slightly lower strength characteristics. The low carbon content also increases the 304L corrosion resistance and welding capacity. • 309 & 310: Are higher in both nickel and chromium content than the lower alloys, and are recommended for use in high temperature applications. The 310 contains extra corrosion resistance to salt and other aggressive environments. • 316 & 317: Have significantly improved corrosion resistance especially when exposed to seawater and many types of chemicals. They contain molybdenum, which gives the steel better resistance to surface pitting. These steels have higher tensile and creep strengths at elevated temperatures than other austenitic alloys. Austenitic stainless steel limitations: • They are suitable only for low concentrations of reducing acids. • In crevices and shielded areas, there might not be enough oxygen to maintain the passive oxide film and crevice corrosion might occur. • Very high levels of halide ions, especially the chloride ion can also break down the passive surface film. Martensitic stainless steels are capable of being heat treated in such a way that the martensite is the prime microconstituent. This class of stainless contains 12 to 18% chromium. They can be hardened by heat treatment, have poor welding characteristics and are considered magnetic. The tensile strength of 5 martensitic stainless steel is approximately 70,000 to 145,000 psi. This type of stainless steel should only be used in mild corrosive environments. Common martensitic stainless steel grades: • 410: A straight chromium alloy containing no nickel. General-purpose corrosion and heat resisting, hardenable chromium steel. It can be easily headed and has fair machining properties. Due to their increased hardness, are commonly used for self-drilling and tapping screws. These are considered very inferior in corrosion resistance when compared with some of the 300. • 416: Similar to 410 but has slightly more chromium, which helps machinability, but lowers corrosion resistance. Ferritic stainless steels contain 12 to 18% chromium but have less than 0.2% carbon. This type of steel is magnetic, non-hardenable by heat treatment and has very poor weld characteristics. They should not be used in situations of high corrosion resistance requirements. Common ferritic stainless steel grades: • 430: Has a slightly higher corrosion resistance than Type 410 stainless steel. Precipitation Hardening Stainless Steel Precipitation hardening stainless steels are hardenable by a combination of low-temperature aging treatment and cold working. Type 630, also known commercially as 17-4 PH, is one of the most widely used precipitated hardened steels for fasteners. They have relatively high tensile strengths and good ductility. The relative service performance in both low and high temperatures is reasonably good. Link to comment Share on other sites More sharing options...
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