Selecting the proper grade of cast iron depends on the application; for example, what desired machining characteristics or hardness level is required. Combinations of graphite structures with the different matrix structures will result in a wide variety of grades each having its own unique properties and benefits.

Look in our following section of Continuous Cast Iron Hollow Bar to see our grades comparison, properties and typical applications for each grade and available sizes and shapes.

Grades, Sizes & Shapes
Mechanical Properties
Chemical Compositions
Continuous Ductile Cast Iron Hollow Bar with Higher Strength and Elongation
Continuous Cast Iron Hollow Bar for Specialized Application
Machining Allowance (mm) & Maximum Bending (mm/M)
Size Tolerance in Diameter

 

Grades, Sizes & Shapes:

(1) MATERIAL GRADE:

• Continuous Cast Grey Iron Hollow Bar

HT250
ASTM A48 classes 35-40
JIS G5501 FC 25
DIN 1691 GG25
FGL 250
BS 1452 Grade 17

• Continuous Cast SG Ductile Iron Hollow Bar

QT500-7
ASTM A536-84 65-45-12 / 80-55-06 / 100-70-02
JIS FC D45
DIN 1693 GGG40
BS 2789 SNG 27/12

• Alloyed Iron and other specific grades can be produced on enquiry

 

(2) Shape & Sizes:

outside diameter (mm)	40-70	70-100	100-130	130-160	160-200
wall thickness (mm)	5-9	5-12	5-16	6-20	6-25

Non standard shapes are available on enquiry

[ TOP ]

Mechanical Properties:

(1) Tensile Strength of Grey Cast Iron HollowBar

Type	Size (mm)
	40 - 60	60 - 100	100 - 160	160 - 200
	Minimum Tensile Strength  (Mpa)
HT150	130	120	105	90
HT200	170	160	145	130
HT250	220	200	180	165
HT300	250	230	215	195

 

(2) Tensile Strength & Elongation of Ductile Cast Iron Hollow Bar

Type	Size (mm)
	< 120		120 - 200
	Minimum Tensile Strength  (Mpa)	Elongation (%)	Minimum Tensile Strength  (Mpa)	Elongation (%)
QT450-10	450	10	400	8
QT500-7	500	7	420	5
QT600-3	600	3	550	2
QT700-2	700	2	650	1

[ TOP ]

Chemical Compositions:

Type	Chemical Compositions %
	C	Si	Mn	P	S
HT150	3.2~3.7	2.2~3.4	0.4~0.8	< 0.15	< 0.12
HT200	3.1~3.6	2.2~3.4	0.6~0.9	< 0.15	< 0.10
HT250	3.0~3.6	2.2~3.4	0.7~1.0	< 0.15	< 0.10
HT300	2.9~3.5	2.2~3.4	0.8~1.2	< 0.15	< 0.10
QT450-10	3.2~3.7	2.3~3.2	< 0.4	< 0.08	< 0.03
QT500-7	3.2~3.7	2.3~3.2	< 0.4	< 0.08	< 0.03
QT600-3	3.2~3.7	2.3~3.2	0.3~0.6	< 0.08	< 0.03

* Note: All Chemical Composition data listed here and other places in this website are for reference only, and shall not be taken as a quality acceptance condition in each order contract

[ TOP ]

Continuous Ductile Cast Iron Hollow Bar with Higher Strength and Elongation:

Type	Tensile Strength  (Mpa)	Elongation (%)	Oil Pressure Tightness	Main Chemical Composition (%)			Microstructure
				C	Si	Mn	Graphite	Matrix
GQ800 - 2	750 - 850	1.5 - 3.5	> 40Mpa no leaking nor broken	3.2 - 3.6	2.5 - 3.0	0.2 - 0.5	Nodulizing Grade 1 - 3 Nodule Grade 7 - 6	P: 70-80%
GQ700 - 3	650 - 750	3 - 5		3.2 - 3.6	2.5 - 3.0	0.2 - 0.5		P: 50-70%
GQ600 - 5	550 - 650	4 - 8		3.2 - 3.6	2.5 - 3.3	0.2 - 0.5		P: 40-60%
SGQ550-10	500 - 600	8 - 18		3.2 - 3.6	2.5 - 3.3	0.2 - 0.5		P: 30-50%
SGQ500-15	450 - 550	15 - 22		3.2 - 3.6	2.5 - 3.3	0.2 - 0.5		P: 15-25%
SGQ448-12	400 - 500	8 - 15		3.2 - 3.6	3.3 - 4.0	0.2 - 0.5		P: 5 -15%

[ TOP ]

Continuous Cast Iron Hollow Bar for Specialized Application:

Wear-resistant guide sleeve, ADI bush, Cylinder liner, Guide Sleeve,

Piston ring and other High Performance Tubiform Spare Parts

[ TOP ]

Machining Allowance (mm) & Maximum Bending (mm/M):

Shape	Size	Grey Cast Iron		Ductile Cast Iron
		Allowance	Bending	Allowance	Bending
Round	Ø50	1.5	3	1.5	4
	Ø 50~ Ø 100	2.0	2	2.0	3
	Ø 100~ Ø 150	3.0	2	3.0	3
	Ø 150~ Ø 200	3.5	2	3.5	3
Rectangular (Wider side)	< 150	3.0	3	4.0	3
	150~200	4.0	3	5.0	3

Note:  Max. Bending is not guaranteed as above for heat-treated bars;

[ TOP ]

Size Tolerance in Diameter:

Shape	Dimension (mm)	Tolerance (mm)
		Grey Cast Iron	Ductile Cast Iron
Round	Ø 50~100	0~+2.0	0~+2.5
	Ø 100~150	0~+3.0	-1~+3.0
	Ø 150~200	-1.0~+4.0	-1.0~+4.0

[ TOP ]

Since our company is equipped with complete series of machining facilities, we can produce and supply you machined parts according to your drawings.

We also provide OEMs and Custom-Made. We manufacture not only our own fashions, but also as per your designs / samples.

If you are a wholesaler, distributor, retailer, or manufacturer, we would like to act as your overseas vendor to manufacture according to your design / sample and under your label and logo.