Good high temperature oxidation resistance to 2000°F

Designed for high temperature applications, 310 stainless steel flat head screws provide high temperature oxidation resistance to 2000°F under mild cyclic conditions. An economic alternative to nickel alloys like alloy 330 or Inconel, 310 screws provide slightly less strength and temperature resistance – but at a significantly lower price point.  Alloy 310 flat heads can be used in moderately caburizing, moderately oxidizing, nitriding, cementing and thermal cycling applications when not used at the maximum service temperature. 310SS flat head screws also have good resistance to sulfidation and other forms of hot corrosion.  Although primarily known for its high temperature properties, 310 flat heads also provide excellent performance at cryogenic temperatures, with toughness down to -450˚F. Though 310 is ideal for high temperature use, it should not be exposed to the severe thermal shock of repeated liquid quenching or where aqueous corrosive contaminants are present.

Benefits

  • High temperature resistance.
  • Excellent resistance to oxidation under mildly cyclic conditions.
  • Good resistance to sulfidation and atmospheres where sulfur dioxide gas is encountered at elevated temperatures.
  • Good resistance to thermal fatigue.
  • Excellent toughness to cryogenic temperatures of -450°F.
  • Low magnetic permeability.
  • Good ductility and weldability.

Applications

  • Thermal processing and high temperature furnaces rely on 310 flat head screws for their high temperature and oxidation resistance in minor cyclic conditions.
  • 310SS flat heads are commonly used in the petrochemical industry for their ability to provide resistance to moderately carburizing atmospheres.
  • The high temperature properties of 310 screws make them ideal for ore processing, steel plants, power generation, and sintering.
  • Cryogenic structures often use 310SS flat head screws for their strength at -450°F and low magnetic permeability.

310 Stainless Steel Properties
Tensile Strength (ksi)  70
Yield Strength (ksi) 30
Rockwell B Hardness 95
Density (lb/in3) 0.285
Electrical Resistivity (Microhm-in at 68°C) 30.7
Modulus of Elasticity (x 106 psi) 28.5
Thermal Conductivity at 212°F (BTU/hr/ft2/ft/°F) 8.0

Resources: Flange DimensionsFlange Bolting Chart

Alloy 310 Screw Types: 12 Point Screws, Button Head Cap ScrewsFlat Head ScrewsHex Head Cap ScrewsPan Head ScrewsSet ScrewsSocket Head Cap ScrewsTorx Screws, Vented Screws


310 Stainless Steel Chemistry & Specifications

310SS Specifications: AMS 5521, AMS 5651, ASME SA 240, ASME SA 312, ASME SA 479, ASTM A 240, ASTM A 276, ASTM A 276 Condition A, ASTM A 276 Condition S, ASTM A 312, ASTM A 479, EN 10095, UNS S31008, UNS S31009, Werkstoff 1.4845

310 Chemical Compositon

 


310SS Flat Head Screw Features and Benefits

310 flat head screws are characterized by having a head with a top flat surface (which can feature either a slotted, phillips or allen driver) and bottom that is cone shaped or countersunk. With this design, the head of the screw can align flush or below the surrounding surface having obvious benefits.

310SS Slotted vs. Phillips Driver 

 Slotted Head Advantages Phillips Head Advantages 
  • Slotted head screws tend to strip less than Philips, especially in harsh environments
  • Slotted heads are typically better in applications where it's going to be unscrewed and re-done periodically, as the head tends to wear less.

  • In dirty environments, a flat head is much easier to clean out

  • Phillips head offers a much stronger joint since it can tolerate more torque.

Countersink Angle

For most flat head screw designs the angle of countersink is usually 82° for UNC and UNF applications however other angles ranging from 60° -120° could be specified. 

Thread Type Normal Flat Head Countersink Angle

UNC / UNF

82°

Aerospace 100°
ISO Metric / Imperial 90°

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