ZERON 100 FG (Fastener Grade) Specification

Product Overview: Enhanced Strength (Condition S)

The ZERON 100 FG (Fastener Grade) represents a premium, high-strength version of the standard ZERON 100 Super Duplex alloy (UNS S32760). Its enhanced properties are achieved through a specialized manufacturing process involving light cold working of the round bar stock to its final size. This controlled strain hardening (Condition S) process is implemented to achieve significantly increased tensile properties suitable for high-load bolting applications.

Fasteners produced from ZERON 100 FG are typically manufactured by machining from the bar product. This method contrasts with the cheaper forging method used for the Solution Annealed (SA) grade, ensuring the higher strength is maintained in the finished fastener.

Mechanical Equivalence and Performance

Key Property ZERON 100 FG Grade Reference Standard (Mechanical)
Tensile Properties Increased (via strain hardening) ASTM A193 Grade B7
Manufacturing Method Machined from Bar (Required to maintain strength) N/A
Low-Temperature Toughness Meets 40 Joules at -50°C N/A

Anti-Galling and Lubrication Guidance

While duplex alloys are less prone to galling than 300 series austenitic stainless steels, friction can still be a concern in high-torque applications. To ensure ease of dismantling for pump servicing and critical flange maintenance, successful usage involves applying specialized coatings. Common practices include electroplating ~6µm of copper onto the male stud, or using conventional anti-galling sprays (e.g., copper-loaded greases or PTFE coatings). Molybdenum Disulfide (MoS₂) lubricants should be avoided for elevated temperature service due to the risk of decomposition and resulting sulfide attack.

ZERON 100 FG Round Bar
}