Nickle Alloy Flat Welding Flange Hastelloy C4 Catalytic Support System

Nickle Alloy Flange, also known as a flange rim or flange, is a part that connects pipes to each other at the ends, and it is also used on equipment inlets and outlets for connecting two pieces of equipment, such as a reducer flange. A flange connection or flange joint refers to a detachable connection consisting of a flange, gasket, and bolt, which together form a combined sealing structure.

Welding Process:

• Required Equipment: A set of manual arc welding equipment, one handle-type angle grinder, one electric air hammer, and one straight edge.
• Folding Welding Preparation: 1. Check and adjust the equipment to ensure normal operation; 2. Prepare φ4.0 J402 welding rods, which are preferably dried at 300°C - 350°C for one hour.
• Folding Welding Process: 1. Assemble the cone and the large flange according to the drawing requirements, then divide the large flange into 8 equal parts;  2. Welding due to the thicker flange and larger groove, the use of segmental symmetrical, multi-layer welding is adopted.
• Folding Welding Quality Requirements: The weld strength must at least match the strength of the base material. The weld surface should be flat and smooth, without defects such as burn-through, porosity, welding leaks, slag inclusion, undercutting, or incomplete welding. The weld reinforcement height should be less than 2mm.
• Folding Notes for Attention: 1. When welding the base layer, always use J506 welding rod manual surfacing and welding with a small current. Strictly follow the welding process; 2: After welding each position, use a level to check the deformation of the flange plane; 3: While welding, use the air hammer to strike the weld to eliminate stress.

Hastelloy C4: 

This Nickel-Chromium-Molybdenum alloy tolerates high temperatures and gives a designfreedom in areas where weld geometry makes excessive heat buid-up unavoidable. Resistance to general and localised corrosion and stress corrosion cracking is generaly similar to Hasteloy C-276.With its high contents of Chromium and Molybdenum Hastelloy C-4 is able to withstand both
oxidizing and non-oxidizing acids, and is resistant to pitting and crevice attacks in thepresence of chlorides and other halides. Like
other nickel alloys, Hastelloy C-4 is ductile, easy to form and weld. Hastelloy C-4 is also known as Nicrofer 6616.

Key Features
 

Hastelloy C-4 offers the following key features: Excelent resistance to stress-corrosioncracking and to oxidizing atmospheres at hightemperature. xceptiona resistance to a wide variety of chemical process environments including, hotcontaminated minera acids,so vents,chorineformic and acetic acids,and salt waters.
 

Designations
 

W.NR 2.4610
UNS NO6455
AWS 052

Specifications
 

ASTM B574

ASTM B619

Chemical Composition:

Designantion and standards:

The typical mechanical properties of HastelloyC-4:

Processing Flow Chart: