Nickel Alloy Steel Hot Rolled Bar

Hot rolled bars are economical bars processed through hot rolling technology, featuring high production efficiency, significant cost advantages, and wide specification range. They are widely used in general machinery manufacturing, structural component processing, fastener production, and other fields. The nickel alloy hot rolled bars supplied by Hefei Tailan Metal Co., Ltd. are manufactured from high-quality nickel-based alloy continuous casting billets or rolled billets through multiple processes including heating, multi-pass hot rolling, online controlled cooling, straightening, and saw cutting. Featuring uniform structure, stable mechanical properties, good surface quality, and large-scale supply capability, they are specifically designed for industrial applications with requirements for cost and delivery time, while maintaining certain material performance standards.

Hot Rolling Process Characteristics:

1. Hot Rolling: Rolling above recrystallization temperature, high production efficiency, low cost
2. TMCP (Thermo-Mechanical Control Process) : Controlled rolling and cooling processes, optimizing structure and properties
3. Online Straightening: Ensuring bar straightness
4. Saw Cutting to Length: Supplied in standard lengths or cut to customer requirements

Supply Range

Diameter (d): 10mm – 300mm (3/8 inch – 12 inches); Larger sizes negotiable

Length (L): Random length: 3-9 meters; Fixed length: Precision cut as per customer requirements

Shape: Round, Square, Flat, Hexagon

Diameter Tolerance: Ordinary Tolerance: ±0.5mm – ±1.5mm; Higher Tolerance: ±0.3mm – ±1.0mm

Straightness ≤3mm/m (Hot Rolled); ≤1.5mm/m (after straightening)

Multiple Delivery Conditions Available

Various delivery conditions available according to subsequent processing requirements:

1. Hot Rolled: Most economical, suitable for rough machining or forging blanks
2. Pickled: Scale removed, easy for surface inspection and subsequent processing
3. Turned: Surface defects removed, higher dimensional accuracy
4. Annealed: Reduced hardness, improved machine-ability

Dimensional Inspection

1. Diameter: Online or offline inspection using calipers, laser diameter gauges
2. Ovality: Measuring maximum and minimum diameters, calculating ovality
3. Length: Measuring using tape measures

Surface Quality Inspection

1. Visual Inspection: Inspecting surface for cracks, folds, scars, scratches, and other defects
2. Pickling Inspection: Pickling when necessary to expose surface defects

Grade Cross-Reference: Which Specification Governs Your Bar

The trade name on a purchase order is not enough to place an order. Each nickel alloy bar and rod form is governed by its own ASME Section II specification, and quoting the wrong one is the most common reason a mill quote comes back as grade not available. The table below maps the trade names to the UNS number and to the specification that actually covers the bar product form.

Note that the same UNS number is covered by different specifications for different product forms. Inconel 625 is SB-446 for rod and bar, SB-444 for pipe and tube, SB-443 for plate, sheet and strip, SB-366 for factory-made wrought fittings and SB-564 for forgings. Always state the product form alongside the grade.

Specified Mechanical Properties: Inconel 625 (UNS N06625)

ASME SB-446 Table 1 sets the condition and the room temperature tensile properties for hot-worked rod and bar and cold-worked rod. Two grades are recognised. Grade 1 is annealed at a minimum of 1600°F (871°C); Grade 2 is solution annealed at a minimum of 2000°F (1093°C), with or without a subsequent stabilization anneal at 1800°F (982°C) to increase resistance to sensitization. The size band matters: Grade 1 carries a higher strength below 4 in (102 mm) than above it.

Forging quality material is furnished to the chemical requirements and surface inspection only, with no tensile properties required, and is typically supplied in the hot worked condition.

Permissible Diameter Variations: Hot-Worked Rod and Bar

ASME SB-446 Table 4 sets the permissible variation from the specified dimension for hot-worked rod and bar. The same table governs the distance between parallel surfaces of squares and, separately, the width and thickness of rectangles. Note that the variation applies to the specified size, not to the nominal size, and that the tolerance band widens sharply above 4 in (101.6 mm). Rough-turned or ground rod and forging quantity rod are covered by their own tighter rows in the same table.

Related Nickel Alloy Supply

For the matching tube and pipe form, see our nickel alloy round pipe range, or ask our export desk for a mill certificate quote against the grade and specification you need.