Hydraulic Cylinder Honed Tubes and Chrome Piston Bar

• MPa Classfication: High Pressure Piping
• Material: Carbon Steel
• Standard: ASTM, GB, API, DIN, JIS
• Diameter: ID50-400
• Medium: Liquid
• Cross-Section Shape: Round
• Model NO.: tubes: ID50-400 bar: OD above 12
• Connection Type: Seamless
• Transport Package: in Bundel, with Plastics on Both Ends, Oil Coated
• Specification: tubes: ID50-400 bar: OD above 12
• Trademark: BAIHENG
• Origin: China
• HS Code: 73049000
• Production Capacity: 100 Ton Per Week

Product Description

For tubes:

1. Material we have :
DIN2391 standard ST52, St45,  EN10305 standard E355,E255, ASTM A106B grade, 16Mn, C20/20#, CK45
 2. Chemical composition:

Material	C	Si	Mn	S(≤)	P(≤)	Cr	Ni	Mo	other
A106B/ C20#	0.17-0.23	0.17-0.37	0.35-0.65	0.035	0.035	≤0.25	≤0.30		Cu≤0.25
CK45#	0.42-0.50	0.17-0.37	0.50-0.80	0.035	0.035	≤0.25	≤0.30		Cu≤0.25
Q345B	≤0.20	≤0.55	1.00-1.60	0.040	0.040	V:0.02-0.15	Nb:0.015-0.06	Ti:0.02-0.20	Alt≥0.015
ST52 E355 16Mn	≤0.20	≤0.55	1.00-1.60	0.045	0.045	V:0.02-0.15	Nb:0.015-0.06	Ti:0.02-0.20	16Mn
25Mn	0.22-0.30	0.17-0.37	0.70-1.00	0.035	0.035	≤0.25	≤0.25
27SiMn	0.24-0.32	1.10-1.40	1.10-1.40	0.030	0.030
42SiMn	0.39-0.45	1.10-1.40	1.10-1.40	0.030	0.030
42CrMo	0.38-0.45	0.17-0.37	0.50-0.80	0.025	0.025	0.90-1.20		0.15-0.25

 
 
Accuracy&Mechanical
3. Tube Accuracy :

Working method	Cylinder ID (mm)	Length (m)	Straightness (mm/m)	Tolerance on ID	Tolerance on WT	Roughness (μm)
Cold drawn	40-320	≤12M	0.2-0.5	/	±5%	0.8-1.6
Cold rolling	30-100	≥12M	0.2-0.5	/	±5%	0.8-1.2
cold drawn-honed	40-500	8M	0.2-0.3	H8-H9	±5%	0.2-0.4
Cold drawn-skived	40-400	9M	0.2-0.3	H8-H9	±5%	≤0.2
Hole boring-honed	320-400	8M	0.2-0.3	H7-H9	±8%	≤0.4
Hole boring-skived	320-400	9M	0.2-0.3	H8-H9	±8%	≤0.2

4. Mechanical property:

Final Supply Condition	Cold drawn finished (BK)		Cold drawn and stress-relieved (BKS / SR)			Hardness HB
Parameters	Tensile Strength (MPA)	Elongation δ%	Tensile Strength (MPA)	Yield Strength (MPA)	Elongation δ%
A106B/ C20 / 20#	≥550	≥8	≥520	≥470	≥12	175
45#(CK45)	≥650	≥5	/	/	/	/
16Mn(ST52,E355)	≥640	≥5	≥600	≥520	≥15	190
25Mn	≥640	≥5	≥600	≥510	≥15	195
27SiMn	≥840	≥5	≥800	≥720	≥10	230

 For bar /  rods:
 
1. CHEMICAL COMPOSITION

Material	C%	Mn%	Si%	S%	P%	V%	Cr%
CK45	0.42-0.50	0.50-0.80	≤0.04	≤0.035	0.035		≤ 0.25
ST52	≤0.22	≤1.6	≤0.55	≤0.04	≤0.04
20MnV6	0.16-0.22	1.30-1.70	0.10-0.50	≤0.035	≤0.035	0.10-0.20	≤0.30
42CrMo4	0.38-0.45	0.60-0.90	0.15-0.40	≤0.035	≤0.035	0.07-0.12	0.90-1.20
40Cr	0.37-0.45	0.50-0.80	0.17-0.37	≤0.035	≤0.035		0.80-1.10

 
2. MECHANCIAL PROPERTIES

Material	T.S  N/MM2	Y.S  N/MM2	E%(MIN)	CHARPY	CONDITION
CK45	610	355	15	>41J	NORMALIZE
CK45	800	630	20	>41J	Q + T
ST52	500	355	22		NORMALIZE
20MnV6	750	590	12	>40J	NORMALIZE
42CrMo4	980	850	14	>47J	Q + T
40Cr	1000	800	10		Q + T

3. SUPPLY CONDITION
    Ground and chrome plated , induction, quenched and tempered
4. CHROME THICKNESS
     20 to 30 micron
5. SURFACE ROUGHNESS
     Ra≤0.2 micron and  Rt≤2 micro
6. TOLERANCES ON DIA
    ISO f7 on the diameter
7.OVALITY
Half of the tolerance ISO f7
8. STRAIGHTNESS
   ≤0.2MM/M
9. SURFACE HARDNESS
   850-1150HV (vickers 100g)
10.COHESION
   No cracks,breaking or detaching after thermic shock(warming up at 300 celsius degrees and cooling in water)
11 .POROSITY
     Test according to ISO 1456/1458 and result yaluation according to ISO 4540 rating 8-10
12 CORROSION RESISTANCE
     Test in natural salt spray according to ASTM B 117-72hours
     Results evaluation according to ISO 4540 RATING 7-10
13. PACKING
     Anti rust oil to be applied on material and each rod to be packed in paper sleeve