6323-4 Cold Finished Seamless Steel Tube

BSI – BS 6323-4 Specification for seamless and welded steel tubes for automobile, mechanical and general engineering purposes – Specific requirements for cold finished seamless steel tubes. cold finished seamless tubing possesses a high strength-to-weight ratio and can be processed to provide a combination of desired characteristics: dimensional accuracy; good surface quality; excellent micro-structure uniformity; good machinability; and high tensile properties. It is also suited for such post-treatments as carburizing and heat treating.

Benefits Of 6323 Part 4 Seamless Steel Tubes

Higher Strength & Hardness Properties

Size Accuracy

Enhanced Appearance

Uniform Micro-structure

Easier To Machine

Superior Finish In Subsequent Manipulations

6323 Part 4 Seamless Steel Tubes Applications

1.Hydraulic Cylinders

2.Auto and Truck Axles

3.Suspension parts and shock absorbers

4.High Speed Shafts and rollers

5.Bearings and Spacers

6.Roll cages

7.Agricultural components and many other machined tubular parts.

Standards

BS EN 6323 part 4 specific requirements for cold finished seamless steel tubes

6323 Part 4 Seamless Steel Tubes Chemical Component

Steel Grae	C	Si	Mn	Cr
CFS 3	0.20 max	0.35 max	0.90 max	–
CFS 3A	0.20 max	0.10 to 0.35	0.60 to 1.00	–
CFS 4	0.25 max	0.35 max	1.20 max	–
CFS 5 b	0.23 max	0.50 max	1.50 max	–
CFS 6	0.30 to 0.40	0.35 max	0.50 to 0.90	–
CFS 7	0.20 to 0.30	0.35 max	1.20 to 1.50	–
CFS 8 c	0.40 to 0.55	0.35 max	0.50 to 0.90	–
CFS 9	0.29 max	0.35 max	1.50 max	–
CFS 10	0.26 max	0.35 max	0.80 max	0.80 to 1.20
CFS 11	0.45 max	0.35 max	1.00 max	0.80 to 1.20

6323 Part 4 Seamless Steel Tubes Mechanical Property

Steel Grade	BK (cold finished/hard)			BKW (soft)			GBK (annealed)			NBK (normalized)
	Yield (Re)	Tensile (Rm)	Elongation (A)	Yield Re min.	Tensile Rm min.	A min.	Yield Re min.	Tensile Rm min.	A min.	Yield Re min.	Tensile Rm min.	A min.
CFS 3	360	450	6	280	400	9	170	340	26	215	360	24
CFS 3A	360	450	6	280	400	9	170	340	26	215	360	24
CFS 4	415	520	5	315	450	8	200	400	24	235	410	22
CFS 5	480	600	4	385	550	6	–	–	–	340	490	20
CFS 6	470	590	5	350	540	7	300	440	22	280	460	21
CFS 7	560	700	4	460	650	7
CFS 8	575	720	4	470	670	6	300	510	20	340	540	18
CFS 9	575	720	4	470	670	6
CFS 10	575	720	4	470	670	6
CFS 11	575	720	4		670	6

6323 Part 4 Seamless Steel Tubes Drawing Process

Floating/Drawing process of pulling a metal bar, rod, or wire through the whole of a die to alter its finish, shape, size, and/or mechanical properties. The tube drawing technique reduces the outer diameter, inner diameter, and wall thickness of the tube. The integrity of the surface of the tube is maintained, ideal for stainless steel tubes.

6323 Part 4 Seamless Steel Tubes Annealing Process

Annealing is used to soften the metal before further cold working or fabrication processes, and improves the overall metallurgical microstructure of the tube. During tube reduction or cold drawing, it can become hard and somewhat brittle. To be able to draw the tube again, stresses formed during cold working need to be removed to return the material to its normal state.

During annealing the tube is heated to a controlled temperature (up to 2100°F) and soak time. Through this process the tube remains in shape, but the grains in the structure of the tube reform into a regular unstressed pattern. The resulting annealed tube is softer and suitable for redrawing.

6323 Part 4 Seamless Steel Tubes Manufacturing process

Tubular Products seamless mechanical tubing is produced from solid round billets by rotary piercing and then rolled in an Assel mill that permits an extremely broad range of diameter/wall thickness ratios. Tubes are then processed through a multiple-pass size reducing mill and a rotary sizer.

Tube lengths from the hot mill are slowly air cooled or moved directly to a unique is othermal annealing furnace to ensure a uniform microstructure hardness to promote excellent machinability. This process contrasts with conventional slow-cool furnaces, where tubes are cooled in bundles. That can result in variations in microstructure and hardness from tube to tube and even within a tube itself.

After cooling, tubes are pickled in an acid bath to remove mill scale and inspected. Minor imperfections are removed by grinding prior to cold drawing and additional processing. During the cold drawing process, tubes are drawn in a controlled fashion over a mandrel and through a die to reduce the diameter and wall thickness. After forming and depending on customer requirements, the tubing is stress relief annealed, straightened and cut to length. Tubes are inspected for dimensional accuracy and surface finish.

Cold working, applied to both inside and outside surfaces, improves surface finish, increases tensile properties, improves machinability in many grades and results in more precise dimensions. Outside diameter and wall thickness tolerance are improved by approximately 50 percent.

6323 Part 4 Seamless Steel Tubes Packaging

Straight lengths of seamless tubing can be individually sleeved in paper or plastic and/or packaged in our unique cardboard spacers to ensure no damage occurs during transit. Coiled seamless tubes are horizontally packed using paper or cardboard separators to prevent tube-to-tube contact. All tubing is packed in either wooden crates lined with wax craft paper, tri-wall clay-coated reinforced cases, or standard cardboard boxes. Plastic end caps that prevent foreign material from getting inside the tubes are also available upon request.

Other Services

1 Cutting: Small pieces

2 End: Plaint or Beveled or threaded

3 CNC Machine: Produce as your drawing

4 Package: Bare/Nylon/Canvas/Wooden

5 Payment:T/T, L/C, O/A(request credit)

6 Transport:FOB/CFR/CIF/DDU/DDP (train/ship/Air)

Contact Fushun 6323 Part 4 Seamless Steel Tubes Today

Contact us for more information regarding precision steel tubing specifications and product options, or request a quote for further pricing details today.