1. Decreasing maintenance cost of equipments 2. Reducing energy consumption of mill equipment 3. Improving operation rate

 

                            

 

 

RK  Hot rolled welded steel pipe

  Comparsion Chart

Grade	Mild pipe	SLS600 Induction hardened steel	Ultra-met steel	Ceramite cast stee
Hardness	120-150BHN	600 BHN	>600BHN	>8Mohs
Max temperature(°F)		450	1250	2195
Impact resistance	Good	Average	Marginal	Poor
Abrasion resistance	Poor	Good	Very good	Excellent
Std size(OD)	Unlimited	3''to26'	10''to40''	4''to24''
Handling&Installation	Excellent	Very good	Very good	Heavier
Fabrication	Unlimited	Some limitaions	Some limitaions	Some limitaions
Emergency repair	Easily patched	Easily patched	Easily patched	Easily patched
Initial cost		3-8 times above mild steel	6-10 times above mild steel	4-8 times above mild steel
Life expectancy		Up to 6 times mild steel	Up to 8 times mild steel	Up to 15 times mild steel
Advantages	Low cost Readily avaliable	A good combination of abrasion&impact resistance	Good wear resistant,moderate temperaure resistance	High wear resistant,good therma shock resistant
Disadvantages	Poor abrasion resistant	No corrosion resistance	Limited length&diamter	Heavier

Chemical composition,mechanical properties and metallographic examination

C	Si	Mn	Cr	other
4.0~5.5	0.5~1.5	0.5~2.5	24.0~30.0	less than 2.0

HRC 55-60

HRC 61-65

   

 

     

Hot rolled welded steel pipe