Specifications

Hydraulic using honed tube H& H* H9 ST52 DIN2391
1. ID 50-250mm
2. Max length 20 meters.
3.Technology:Cold drawn
4.High re

Hydraulic using honed tube H& H* H9 ST52 DIN2391

1.Variety

Processing	Cylinder I.D	Length /mm	Straightness	Size accuracy	Inner bore roughness
Cold-drawn	30~250	≤12M	0.3~1.0mm/m	H8-H10	0.8~1.6um
Honed tube	40~400	≤10M	0.3~1.0mm/m	H7-H9	0.4~0.8um
SRB	40~400	≤7M	0.3~1.0mm/m	H8	0.1~0.4

 

2. Material Specification and Ref. Document  

 

ST52,BK+S,DIN2391 or Equivalent

 

3. Chemical Compisition (%)

 

	C	Mn	Si	S(Max)	P(Max)
CK20	0.17-0.24	0.35-0.65	0.17-0.37	0.035	0.035
CK45	0.42-0.5	0.5-0.8	0.17-0.37	0.035	0.035
St52	≤ 0.22	≤ 1.6	≤0.55	0.025	0.025
27SiMn	0.24-0.32	1.1-1.4	1.1-1.4	0.035	0.035

 

4. Mechanical Properties

 

Material	Tensile strength	Yield strength	Elongation	Hardness
Ck20	510 σ N/mm2	500σsN/mm2	5δs%	175HB
Ck45	660 σN/mm2	630σsN/ mm2	4δs%	207HB
ST52	580σ N/mm2	420σsN/ mm2	10δs%	190HB
27SiMn	840σ N/mm2	805σsN/ mm2	7.5δs%	230HB

 

5. Supply Condition

 

 Cold drawn seamless steel tube, stress relieved and honed or skived roller burnished

 

6. Surface Roughness

 

 Ra = 0.4~0.8 Micron

 

Process

 

• Cold drawn/cold rolled

        Annealing furnace——+SR

 

            Straightener—— Straightening

 

 

•  Straightness inspecting

 

 

• Dimension inspecting

 

  

 

• Sawing

 

 

 

• Lathe

 

• Honed

 

 

• Products inspecting

 

 

• Finished Products

 

 

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