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ASME 304 / 304L Duplex Stainless Steel Fasteners 1/2" - 2 1/2" Bolt Nut Washer

Zhengzhou Huitong Pipeline Equipment Co.,Ltd.

ASME 304 / 304L Duplex Stainless Steel Fasteners 1/2" - 2 1/2" Bolt Nut Washer

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Brand Name : HT

Model Number : ASME: 1/2"~2 1/2" Bolt Stainless Steel 304/304L Duplex Stainless Steel Fasteners

Certification : ISO9001

Place of Origin : China

MOQ : 1 pcs

Price : USD 1000/piece

Payment Terms : L/C,T/T, Western Union

Supply Ability : 1000 pcs per month

Delivery Time : 30-35 working days

Packaging Details : wooden case, wooden pallet

Product Type : bolt nut washer

Name : ASME: 1/2"~2 1/2" Bolt Stainless Steel 304/304L Duplex Stainless Steel Fasteners

Size : M6-M100

Finish : Cold galvanizing, Hot-dip Galvanizing, PTFE, Zinc Nickel, Black coating, Plain

Standard : DIN931 DIN933 DIN912 DIN934 DIN125 DIN127

Material : Nickel alloy/stainless steel/duplex stainless

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ASME: 1/2"~2 1/2" Bolt Stainless Steel 304/304L Duplex Stainless Steel Fasteners

1.ANSI/ASME B 18.2.6 - 2003 Heavy hex nuts for use with structual bolts, ASTM A 563 / ASTM A 194

2.What are the differences between 18-8, type 304, and type 316 stainless steels?

To answer this question, you first need to know some basic information about stainless steel. “Stainless Steel” is the general name for a large family of alloy steels that contain at least 10.5% chromium as part of their composition. At and above this level of chromium, a complex chrome-oxide surface layer forms that prevents further oxygen atoms from penetrating into the steel and thus protects the iron in the matrix from rusting. This layer is what makes the steel “stainless.” Higher levels of chromium and the addition of other alloying elements such as molybdenum and nickel enhance this protective barrier and further improve the corrosion resistance of the stainless steel. There are many different types of stainless, but by far the most popular and widely used are the 300 series stainless steels, also known as the austenitic stainless steels.

The 300 series designation contains many different compositions of alloy steel (303, 304, 305, 316, 321, 347, etc.) but the common factors among them are:

  • Their carbon content is generally held to a maximum of 0.08%
  • They (generally) have 18% chromium
  • They (generally) have 8% nickel
  • They are non-magnetic
  • They cannot be hardened by heat treatment
  • They can be hardened by cold working the material (“work hardening.”)

The term “18-8” is often used to designate products made from 300 series stainless. This “18-8” call out is referring to the 18% chromium/8% nickel alloy mixture of the steel. “18-8” is not an actual specification, as it only refers to two different alloys in the steel. While all 300 series stainless steels share this 18/8 mix, slight differences in chemical composition between the different grades of the 300 series do make certain grades more resistant than others against particular types of corrosion. In the fastener industry the term “18-8” is often used as a designation for a bolt, nut, or washer manufactured from 300 series stainless steel material that has the 18% chromium/8% nickel alloy mixture. However, a fastener manufactured from stainless material that meets the 18/8 alloy mix does not necessarily meet the other slight differences in chemistry required to certify it as Type 304 stainless. Type 304 is by far the most popular of the 300 series stainless steels.

The second most popular type of stainless, after Type 304, is Type 316. In Type 316 stainless, the chromium content is lowered from 18% to 16%, however, the nickel content is raised to 10% and 2% molybdenum is added to the mixture. This change in the chromium/nickel ratio and the addition of the molybdenum increases the resistance to chlorides. This is why Type 316 stainless is often used in more corrosive environments where the material will be exposed to chemical, solvent, or salt water corrosion and makes it the preferred material for marine construction.

3.What are the differences between hex bolts ordered as type 304 stainless steel, A193 Grade B8, and F593 Group 1 (type 304 stainless)?

Hex bolts are often ordered as a type 304 stainless and not to a specific ASTM specification. When bolts are ordered under the raw material grade (type 304) and not to an ASTM fastener specification, there are no specific requirements other than that they meet the chemical and physical requirements of 304 stainless steel and ASME B18.2.1 dimensional requirements for hex bolts. National coarse thread will typically be provided unless otherwise specified.

Type 304 stainless steel hex bolts that are ordered under the ASTM fastener specification A193 grade B8 are required to be both carbide solution annealed and stamped per the A193 specification. Carbide solution annealing is a process of heating the material up to a temperature of 1,950 degrees or above and maintaining the temperature long enough for the chromium carbides to go into the solution. This process will bring the bolts back to their optimal corrosion resistant condition after the forging (heading) process. The heads of bolts and one end of rods must be marked with “B8” and a unique manufacturer’s identifier. The A193 specification also requires 8 threads per inch above one inch diameter unless specified otherwise.

A type 304 stainless steel hex bolt that is ordered as ASTM F593 Group 1 must have additional processes performed that exceed the requirements of A193 grade B8. These bolts must be stamped with a manufacturer’s identifier, “F593″, and the proper condition designation, and if the bolts are hot formed, they must also be carbide solution annealed. Additionally, F593 bolts must pass an intergranular corrosion test, which is not required when bolts are ordered as type 304 stainless or under the ASTM A193 grade B8 specification. F593 does not have the same 8UN series thread requirement above 1″ diameter as A193 grade B8, and is typically provided with Unified National Coarse threads. The F593 specification is also characterized by a maximum diameter of 1-1/2”.

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double ended stud


duplex steel fasteners

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