What is the tensile strength of 200 nickel - Knowledge

1.What is the tensile strength of nickel 200?

The tensile strength of Nickel 200 is not a fixed value; it varies significantly depending on its heat treatment state and cold working degree (i.e., the amount of mechanical deformation applied at room temperature, which affects the material's hardness and strength). Below are the typical tensile strength ranges for Nickel 200 in common processing conditions, aligned with industry standards (such as ASTM specifications):

Annealed State (Full Soft Condition):
This is the most common state for Nickel 200, where the material is heated to a high temperature (typically 870–980°C, or 1600–1800°F) and slowly cooled to relieve internal stresses, resulting in maximum ductility and minimum strength.

Tensile Strength: 310–420 MPa (45,000–61,000 psi).

Key Note: In this state, Nickel 200 is highly malleable, making it suitable for forming processes like bending, welding, or deep drawing-common in applications such as chemical storage tanks or electrical components.

Cold-Worked State (e.g., Half-Hard, Full-Hard):
Cold working (e.g., rolling, drawing, or extrusion without subsequent annealing) increases the material's dislocation density, thereby raising its tensile strength at the cost of reduced ductility. The more severe the cold working, the higher the tensile strength:

Half-Hard Condition: Tensile strength ranges from 480–620 MPa (70,000–90,000 psi).

Full-Hard Condition: Tensile strength can reach 690–830 MPa (100,000–120,000 psi).

Application Example: Cold-worked Nickel 200 is used in parts requiring higher mechanical resistance, such as spring contacts or thin-walled pressure tubes, where ductility is less critical than strength.

It is important to reference the material's certificate of analysis (CoA) or manufacturer's datasheet for exact tensile strength values, as minor variations in impurity content (e.g., trace amounts of iron or copper) can also slightly affect performance.

2.What is the ASTM standard for nickel 200?

ASTM International (American Society for Testing and Materials) has developed a series of product-specific standards for Nickel 200, each governing the manufacturing, chemical composition, mechanical properties, dimensional tolerances, and testing requirements for different forms of the material. These standards ensure consistency and reliability across industries. The key ASTM standards for Nickel 200 are categorized by product type below:

Product Form	ASTM Standard Number	Standard Title	Key Scope
Plates, Sheets, and Strips	ASTM B162	Standard Specification for Nickel Plate, Sheet, and Strip	Covers flat-rolled Nickel 200 products (thicknesses from thin sheets to thick plates). Defines chemical limits (e.g., Ni ≥ 99.6%, Fe ≤ 0.15%), mechanical properties (tensile strength, elongation), and testing methods (chemical analysis, tensile tests).
Seamless Tubes	ASTM B163	Standard Specification for Nickel Seamless Tubes	Applies to seamless Nickel 200 tubes used in pressure systems, chemical processing, or heat exchangers. Specifies dimensional tolerances, wall thickness uniformity, and non-destructive testing (e.g., hydrostatic testing for leak tightness).
Welded Tubes	ASTM B164	Standard Specification for Nickel Welded Tubes	Governs Nickel 200 tubes manufactured by welding (e.g., TIG or laser welding). Includes requirements for weld quality (e.g., no cracks or porosity) and post-weld heat treatment to restore ductility.
Bars and Rods	ASTM B165	Standard Specification for Nickel Rod and Bar	Covers solid Nickel 200 products (round, square, or hexagonal rods/bars) used for machining, forging, or fabricating components like fasteners or valve stems. Details mechanical properties (e.g., yield strength, impact resistance) and straightness tolerances.
Forgings	ASTM B166	Standard Specification for Nickel Forgings	Applies to Nickel 200 forgings (e.g., flanges, fittings, or complex shapes) formed by hot forging. Requires control of forging temperatures to avoid grain coarsening and specifies mechanical testing of forging samples.
Wire	ASTM B167	Standard Specification for Nickel Wire	Covers Nickel 200 wire (various diameters) for applications like electrical windings, springs, or welding electrodes. Defines tensile strength for different cold-worked states (e.g., annealed, hard-drawn) and surface finish requirements.