WUXI PAZON TECHNOLOGY CO., LTD
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The Chrome Plated CK45 Rod (Q&T + I.H.) combines a quenched & tempered core (220–360 HB) with an induction-hardened surface (50–62 HRC, depth 0.5–3.5 mm) and hard chrome plating (850–1150 HV). Available in φ6–300 mm, up to 8000 mm long, ISO f7 tolerance, and 200-hour salt spray rating 9. Designed for extreme heavy-duty cylinders, it offers maximum core strength, surface wear resistance, and full customization.
PZPR0004
PAZON
The Chrome Plated CK45 Rod (Q & T + I.H.) is produced from premium CK45 medium carbon steel, processed with dual heat treatment—Quenched & Tempered plus Induction Hardened—followed by precision grinding and hard chrome plating. The Q&T treatment gives the core a high-strength, tough matrix at 220–360 HB, while induction hardening produces a high-hardness surface layer of 50–62 HRC at a controlled depth of 0.5–3.5 mm. Topped with a 850–1150 HV hard chrome deposit, this rod features a “tough core, hard skin” gradient structure, offering ultimate load-bearing capacity, wear resistance and fatigue performance. It is engineered for extreme-duty hydraulic cylinders, mining machinery, marine equipment and heavy construction applications—the top-tier choice in piston rod solutions.
Diameter: Mainly φ6–300 mm, larger custom sizes accepted
Length: ≤8000 mm, custom lengths available
Straightness: ≤0.2 mm/M
Tolerance Grades: IT6–IT9
OD Tolerance: According to ISO f7/f8/g6/h7/h8/h9; customized tolerances available upon request
Ovality: Half of the tolerance value ISO f7
Heat Treatment: Quenched & Tempered + Induction Hardened; customization options: Q&T only, I.H. only, QPQ, etc.
Core Hardness (Q&T): 220–360 HB
Surface Hardness (I.H.): 50–62 HRC
Hardening Depth: 0.5–3.5 mm (adjustable)
Surface Treatment: Hard Chrome Plated; customization options: EN Plating / Zinc Plating / Laser Cladding / Nitriding / QPQ / Thermal Spraying / Ceramic Coating
Chrome Thickness: ≥10 μm, mainly 20–40 μm; can be over 100 μm for high-standard requirements
Chrome Layer Hardness: 850–1150 HV (Vickers 100 gf)
Surface Roughness: Ra≤0.2 μm, Rt≤2 μm
Cohesion: No cracks, breaking or detaching after thermal shock (warming up at 300 ℃ and cooling in water)
Porosity: Tested according to ISO 1456/1458, evaluation according to ISO 10289 rating 8–10. Under 10× magnification, no more than 30 micro white pin-holes per 1000 mm², with diameter not greater than approx. 0.1 mm
Corrosion Resistance: Tested in neutral salt spray according to ISO 9227/ASTM B117 – 96 hours, rating 9 per ISO 10289
Weldability: Fair (welding on the induction-hardened zone should be avoided; pre-weld machining to remove the hardened layer and post-weld stress relieving are recommended)
Packing: Anti-rust oil + cardboard tube/plastic sleeve + wooden case
The only configuration that combines Q&T core strengthening with I.H. surface hardening, achieving an ideal “tough core + ultra-hard surface” gradient
Q&T core at 220–360 HB delivers superior bending, impact and fatigue resistance
Induction-hardened surface at 50–62 HRC with adjustable depth provides outstanding wear and indentation resistance
Hard chrome overlay (850–1150 HV) adds a second wear-resistant shield, dramatically prolonging seal life
Tight f7 tolerance and low ovality ensure smooth motion and reliable sealing even under heavy loads
96-hour salt spray rating 9, combined corrosion protection for harsh environments
Fully customizable dimensions, hardness profiles and processing to serve OEM top-tier demands
In addition to standard specifications, we offer:
Custom diameters and lengths, including extra-large sizes
Tolerance grades and non-standard OD tolerances
Higher straightness upon request
Tailored combination of core hardness and induction-hardened case hardness
Precise control of hardening depth
Surface treatment alternatives: zinc plating, electroless nickel, laser cladding, nitriding, thermal spray, ceramic coating
Extra-thick chrome layers beyond 100 μm
Enhanced corrosion resistance and dedicated packing solutions
Limits and Fits Table
The table below provides shaft deviation values for commonly used tolerance grades f7, f8, g6, h7, h8, and h9 to assist your selection according to seal fits.
Limits and Fits Table | ||||||||||||
Diameter | f7 | f8 | g6 | h7 | h8 | h9 | ||||||
es | ei | es | ei | es | ei | es | ei | es | ei | es | ei | |
>6-10 | -0.013 | -0.028 | -0.013 | -0.035 | -0.005 | -0.014 | 0 | -0.015 | 0 | -0.022 | 0 | -0.036 |
>10-18 | -0.016 | -0.034 | -0.016 | -0.043 | -0.006 | -0.017 | 0 | -0.018 | 0 | -0.027 | 0 | -0.043 |
>18-30 | -0.020 | -0.041 | -0.020 | -0.053 | -0.007 | -0.020 | 0 | -0.021 | 0 | -0.033 | 0 | -0.052 |
>30-50 | -0.025 | -0.050 | -0.025 | -0.064 | -0.009 | -0.025 | 0 | -0.025 | 0 | -0.039 | 0 | -0.062 |
>50-80 | -0.030 | -0.060 | -0.030 | -0.076 | -0.010 | -0.029 | 0 | -0.030 | 0 | -0.046 | 0 | -0.074 |
>80-120 | -0.036 | -0.071 | -0.036 | -0.090 | -0.012 | -0.034 | 0 | -0.035 | 0 | -0.054 | 0 | -0.087 |
>120-180 | -0.043 | -0.083 | -0.043 | -0.106 | -0.014 | -0.039 | 0 | -0.040 | 0 | -0.063 | 0 | -0.100 |
>180-250 | -0.050 | -0.096 | -0.050 | -0.122 | -0.015 | -0.044 | 0 | -0.046 | 0 | -0.072 | 0 | -0.115 |
>250-315 | -0.056 | -0.108 | -0.056 | -0.137 | -0.017 | -0.049 | 0 | -0.052 | 0 | -0.081 | 0 | -0.130 |
>315-400 | -0.062 | -0.119 | -0.062 | -0.151 | -0.018 | -0.054 | 0 | -0.057 | 0 | -0.089 | 0 | -0.140 |
>400-500 | -0.068 | -0.131 | -0.068 | -0.165 | -0.020 | -0.060 | 0 | -0.063 | 0 | -0.097 | 0 | -0.155 |
>500-630 | -0.076 | -0.146 | -0.076 | -0.186 | -0.022 | -0.066 | 0 | -0.070 | 0 | -0.110 | 0 | -0.175 |
>630-800 | -0.080 | -0.160 | -0.080 | -0.205 | -0.024 | -0.074 | 0 | -0.080 | 0 | -0.125 | 0 | -0.200 |
>800-1000 | -0.086 | -0.176 | -0.086 | -0.226 | -0.026 | -0.082 | 0 | -0.090 | 0 | -0.140 | 0 | -0.230 |
>1000-1250 | -0.098 | -0.203 | -0.098 | -0.263 | -0.028 | -0.094 | 0 | -0.105 | 0 | -0.165 | 0 | -0.260 |
>1250-1600 | -0.110 | -0.235 | -0.110 | -0.305 | -0.030 | -0.108 | 0 | -0.125 | 0 | -0.185 | 0 | -0.290 |
Chemical Composition
The table presents the standard chemical composition of frequently used materials such as CK45, 25Mn, 20#, ST52, 40Cr, 42CrMo4, 20MnV6 and 38MnVS6 for your reference.
Chemical Composition | ||||||||||
Material | C(%) | Si(%) | Mn(%) | P(%) | S(%) | V(%) | Ni(%) | Cr(%) | Mo(%) | Cu(%) |
CK45 | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.035 | ≤0.30 | ≤0.25 | ≤0.25 | ||
25Mn | 0.22-0.30 | 0.17-0.37 | 0.70-1.00 | ≤0.035 | ≤0.035 | ≤0.30 | ≤0.25 | ≤0.25 | ||
20# | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | ≤0.30 | ≤0.25 | ≤0.25 | ||
ST52 | ≤0.24 | ≤0.55 | ≤1.6 | ≤0.045 | ≤0.045 | 0.01-0.12 | ≤0.50 | ≤0.30 | ≤0.10 | ≤0.55 |
40Cr | 0.37-0.44 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.035 | ≤0.30 | 0.80-1.10 | ≤0.30 | ||
42CrMo4 | 0.38-0.45 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.035 | 0.07-0.12 | ≤0.03 | 0.90-1.20 | 0.15-0.25 | ≤0.030 |
20MnV6 | 0.17-0.24 | 0.17-0.37 | 1.30-1.60 | ≤0.035 | ≤0.035 | 0.10-0.20 | ≤0.30 | ≤0.30 | ≤0.30 | |
38MnVS6 | 0.34-0.41 | ≤0.80 | 1.20-1.60 | ≤0.025 | 0.02-0.06 | 0.08-0.20 | ≤0.30 | ≤0.08 | ≤0.30 | |
Mechanical Properties
The following table lists reference tensile strength, yield strength, elongation and impact energy values for CK45 (hot-rolled, cold-drawn, Q&T), 25Mn, 20#, ST52, Q345D, 40Cr, 42CrMo4, 20MnV6 and 38MnVS6 under various conditions.
Mechanical Properties | |||||
Material | T.S | Y.S | E% | CHARPY | CONDITION |
CK45 | 610 | 355 | 15 | ＞41J | Normalised |
CK45 | 630 | 540 | 15 | ＞41J | Cold Drawn |
CK45 | 800 | 630 | 20 | ＞41J | Q+T |
25Mn | 620 | 520 | 15 | Cold Drawn | |
20# | 520 | 400 | 15 | Cold Drawn | |
ST52 | 500 | 355 | 22 | Normalised | |
Q345D | 620 | 520 | 15 | ＞27(-20°C) | Cold Drawn |
40Cr | 1000 | 800 | 10 | Q+T | |
42CrMo4 | 980 | 850 | 14 | ＞47J | Q+T |
20MnV6 | 750 | 590 | 12 | ＞40J | Normalised |
38MnVS6 | 850 | 580 | 15 | Normalised | |
