Name: Round Steel - Hot-Rolled, Forged & Cold-Drawn Steel Bars
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Round Steel - Hot-Rolled, Forged & Cold-Drawn Steel Bars

Three Process Options: Hot-rolled for cost-effectiveness, forged for superior performance, cold-drawn for high precision.
Comprehensive Material Range: Carbon steel, alloy steel, tool steel, stainless steel, and more.
Stable Performance: Strict process control ensures consistent batch-to-b material properties.
Excellent Machinability: Suitable for various machining processes like turning, milling, and grinding.
Full Certification: ISO 9001, CE certified, with Material Test Certificates provided.

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◉ PRODUCT SPECIFICATION

Product Series Comparison

Parameter	Hot-Rolled Round Bar	Forged Round Bar	Cold-Drawn Round Bar
Production Process	Billet heating and rolling	Billet forging and pressing	Cold drawing and finishing
Surface Quality	Oxide scale covered	Rough surface	Smooth and bright
Dimensional Accuracy	h11-h13	h12-h14	h8-h11
Mechanical Properties	Moderate strength	Best toughness	Highest strength
Cost-Effectiveness	Economical	Premium	Precision

1. Material Grade Selection

Carbon Structural Steel

Q235B: General structural use, good weldability
45#: High-quality carbon steel, high strength after quenching and tempering
C45E: European standard carbon steel, stable performance

Alloy Structural Steel

42CrMo: High-strength alloy steel, wear and fatigue resistant
20CrMnTi: Special gear steel, excellent performance after carburizing
40Cr: Commonly used quenched and tempered steel, good overall properties

Stainless Steel

304/304L: General-purpose austenitic stainless steel, good corrosion resistance
316/316L: Molybdenum-containing stainless steel, better pitting corrosion resistance
430: Martensitic stainless steel, cost-effective

2. Dimensional Specifications

Hot-Rolled Round Bar

Diameter: Φ20mm - Φ300mm
Length: 6m/9m/12m fixed length, non-fixed length up to 18m
Tolerance: ±0.5mm (≤Φ100mm), ±1.0mm (>Φ100mm)

Forged Round Bar

Diameter: Φ100mm - Φ600mm
Length: 3m - 6m
Tolerance: ±1.0mm (≤Φ200mm), ±1.5mm (>Φ200mm)

Cold-Drawn Round Bar

Diameter: Φ4mm - Φ80mm
Length: 3m/4m/6m or customized
Tolerance: ±0.1mm (≤Φ20mm), ±0.2mm (>Φ20mm)

3. Mechanical Properties

Material	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
Q235B	375-500	≥235	≥26	≤156
45#	≥590	≥335	≥17	170-217
42CrMo	≥1080	≥930	≥12	217-269
304	≥520	≥205	≥40	≤187

4. Surface Quality Grades

As-Rolled: Surface with oxide scale, rolling marks allowed
Black Surface: Slightly oxidized, retaining machining allowance
Turned Surface: Machined by lathe, surface roughness Ra≤3.2μm
Polished Surface: Precision ground, surface roughness Ra≤0.8μm

◉ Surfcae selection

SURFACE	CHARACTERISTIC	SUMMARY OF MANUFACTURING METHOD	APPLICATION
NO.1	Silvery white	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.1	lackluster	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.2D	Silvery white	After cold rolling, heat treatment and pickling are carried out	General material, deep material
NO.2B	Gloss is stronger than No.2D	After No.2D treatment, the final light cold rolling is carried out through the polishing roller	The general material
BA	As bright as a sixpence	No standard, but usually a bright annealed surface with high reflectivity.	Building materials, kitchen utensils
NO.3	Rough lapping	Grind with 100~200# (unit) strop tape	Building materials, kitchen utensils
NO.4	Intermediate grinding	Polished surface obtained by grinding with 150~180# strop abrasive tape	Building materials, kitchen utensils
NO.240	Fine lapping	Grinding with 240# strop abrasive tape	kitchenware
NO.320	Very fine grinding	Grinding was carried out with 320# strop abrasive tape	kitchenware
NO.400	The luster is close to BA	Use 400# polishing wheel to grind	General timber, building timber, kitchen appliances
HL	Hairline grinding	Suitable particle material for hair stripe grinding (150~240#) with many grains	Building, construction material
NO.7	It's close to mirror grinding	Use a 600# rotary polishing wheel to grind	For art or decoration
NO.8	Mirror ultrafinish	The mirror is ground with a polishing wheel	Reflector, for decoration