G3473 Carbon Steel Tubes for Cylinder Barrels

Benefits Of G3473 Steel Tubes

Higher Strength & Hardness Properties

Size Accuracy

Enhanced Appearance

Uniform Micro-structure

Easier To Machine

Superior Finish In Subsequent Manipulations

G3473 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.

G3473 Steel Tubes Manugacturing method and heat treatment

Symbol of grade	Manufacturing method	Symbol of manufacturing method	Heat treatment
STC370	Hot-finished seamless process	S-H	As manufactured
STC440	Cold-finished electric resistance welding	E-C	As cold drawn or stress relief annealing
STC510A	Cold-finished seamless process	S-C	As cold drawn or stress relief annealing
	Cold-finished electric resistance welding	E-C	As cold drawn or stress relief annealing
STC510B	Cold-finished seamless process	S-C	Stress relief annealing
	Cold-finished electric resistance welding	E-C	Stress relief annealing
STC540	Hot-finished seamless process	S-H	As manufactured
STC590A	Cold-finished seamless process	S-C	As cold drawn or stress relief annealing
STC590B	Cold-finished seamless process	S-C	Stress relief annealing

G3473 Steel Tubes Sizes and tolerances

Specified outside diameter with tolerance: 4 (+/-0,08) to 300 (+/-0,35) mm

Specified inside diameter with tolerance: 2 (+/-0,15) to 100 (+/-0,35) mm

Lengths: standard length of 6 m ; exact length ; other length

Straightness: The deviation from straightness of any tube length L shall not exceed 0,0015 L. Deviations from straightness over any one metre length shall not exceed 3 mm.

Standards

JIS G3473 Carbon Steel Tubes for Cylinder Barrels

G3473 Steel Tubes Chemical Component

Symbol of grade	C	Si	Mn	P	S	Nb or V
STC370	0.25 max.	0.35 max.	0.30 to 0.90	0.040 max.	0.040 max.	—
STC440
STC510A
STC510B	0.18 max.	0.55 max.	1.50 max.	0.040 max.	0.040 max.	—
STC540	0.25 max.	0.55 max.	1.60 max.	0.040 max.	0.040 max.	0.15 max.
STC590A	0.25 max.	0.35 max.	0.30 to 0.90	0.040 max.	0.040 max.	—
STC590B	0.25 max.	0.55 max.	1.50 max.	0.040 max.	0.040 max.	—

G3473 Steel Tubes Mechanical Property

Symbol of grade	Tensile strength N/mm2	Yield point or proof stress N/mm2	Elongation %
			Test piece No. 11 or test piece No. 12
			Direction parallel to tube axis
STC370	370 min.	215 min.	30 min.
STC440	440 min.	305 min.	10 min.
STC510A	510 min.	380 min.	10 min.
STC510B	510 min.	380 min.	15 min.
STC540	540 min.	390 min.	20 min.
STC590A	590 min.	490 min.	10 min.
STC590B	590 min.	490 min.	15 min.
NOTE : 1 N/mm2 = 1 MPa

G3473 Steel Tubes Appearance

The internal and external surface finish of the tubes shall be typical of the manufacturing process and the heat treatment, and it shall be such that any surface imperfections such as ridges, dents or shallow grooves requiring dressing can be identified. It shall be permissible to dress, by grinding or machining, surface imperfections provided that, after doing so, the dimensions are within the specified tolerances. All dressed areas shall blend smoothly into the contour of the tube. Surface imperfections which encroach on the specified minimum wall thickness shall be considered defects and tubes containing these shall be deemed not to conform to this part of EN 10305.The tubes shall have smooth outer and inner surfaces with a roughness Ra 4 um, unless a reduced roughness of Ra 2 um is specified for the inner surface is specified.

Preparation of ends

The tubes shall be delivered with square cut ends. The ends shall be free from excessive burrs.

G3473 Steel Tubes Inspection

Chemical analysis

Tensile test

Flattening test

Drift expanding test

Dimensional inspection

Visual examination

NDT for verification of leak tightness

G3473 Steel Tubes Protection

The tubes shall be delivered with a temporary protection against corrosion.

The tubes shall be phosphatized before temporary protection.

The tube ends shall be protected with plugs or caps.

G3473 Steel Tubes Option

1:reduced internal roughness of 2 um

2:lengths other than 6 m

3: alternative marking

4: protection by phosphatization

5:protection by galvanization and chromatization type blue-white

6:protection by galvanization and chromatization type yellow

7:protection by galvanization and chromatization type olive green

8:protection of tube ends

9:special packaging

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)

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