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1045 S-CPO®

1045 H-CPO®

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1045/50 High Strength S-CPO®

1045 High Strength H-CPO®

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1045/50 High Strength IHCP®

1045 High Strength H-CPO®
(sizes over 4-1/2")

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PACIFIC Chrome Plated Bar is typically used for hydraulic cylinder rods. It is stocked in two basic conditions; CPO® (Chrome Plated Only) and IHCP® (Induction Hardened and Chrome Plated). The primary difference is that IHCP® bars are induction hardened to give a hard case on the surface for support to the chrome plating; this minimizes surface damage to the chrome from abrasion and/or impact.

Also, AISI 1045/50 CPO® and IHCP® are both available in standard and high strength properties. Thickness of chrome plating is designated as either Standard (0.0005" min.) or Heavy (0.001" min.).

CPO® bars are also stocked in Acralloy® and Stressproof® grades. Acralloy® offers the strength and toughness of a quenched and tempered alloy steel; Stressproof® gives high strength with free machining characteristics.

Grade AISI 1045/50

Standard Chrome Plated Only S-CPO®

Heavy Chrome Plated Only H-CPO®

Induction Hardened & Chrome Plated IHCP®

High Strength-SCPO® S-CPO® HS

High Strength-IHCP®  HS

Grade Stressproof®

Standard Chrome Plated Only S-CPO®

Grade Acralloy®

Heavy Chrome Plated Only®

Chemical Composition

Heat Analysis - ranges and limits %

Grade

AISI 1045/50

C

.43/.55

Mn

.60/.90

P

.040 Max

S

.050 Max

Cr

-

Mo

-

Grade

Stressproof®

C

.40/.48

Mn

1.35/1.65

P

.040 Max

S

.24/.33

Cr

-

Mo

-

Grade

Acalloy®

C

.38/.45

Mn

.75/1.00

P

.035 Max

S

.040 Max

Cr

.80/1.00

Mo

.15/.25

Typical Properties

Approximate - not  for specification

Grade

AISI 1045/50*

Tensile (psi)

90,000

Yield (psi)

75,000

Elongation

10%

Hardness

179 HB

Machinability

56%

Grade

AISI 1045/50**

Tensile (psi)

115,000

Yield (psi)

100,000

Elongation

9%

Hardness

235 HB

Machinability

56%

Grade

Stressproof®

Tensile (psi)

115,000

Yield (psi)

100,000

Elongation

8%

Hardness

241 HB

Machinability

83%

Grade

Acralloy®

Tensile (psi)

120,000

Yield (psi)

100,000

Elongation

20%

Hardness

255 HB

Machinability

55%

* Cold drawn properties apply through 4-1/2" diameter; larger diameters have hot rolled properties, i.e., 50,000 psi approximate yield strength. ** ASTM A311, Class B

Chrome Plating Properties: CPO® and IHCP®

Grade

Standard

Grade

Heavy

Thickness

.0005" min

Hardness

69 HRC min

Thickness

.001" min

Hardness

69 HRC min

Surface Finish

16 RMS max

Surface Finish

16 RMS max

Induction Hardened Properties: IHCP®

Surface Hardness

50 HRC min

Effective Case Depth (to 50 HRC)

.050" min

Shapes and Conditions Available
  • ​1045/50 S-CPO® through 5" Diameter

  • 1045/50 HS S-CPO® from 2-1/2" through 4-1/2" Diameter

  • 1045/50 H-SCP® through 4-1/2" Diameter

  • 1045/50 IHCP® 5" and 5-1/2" Diameters

  • 1045/50 HS IHCP® through 4-1/2" Diameter

  • Acralloy® H-CPO® through 2-1/2" Diameter

  • Stressproof® S-CPO® through 2" Diameter