Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
LAIN TIMOTHY
   2. Issuer Name and Ticker or Trading Symbol
CARPENTER TECHNOLOGY CORP [CRS] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
VP-Controller, Chf Acctg Ofcr
(Last)
(First)
(Middle)
C/O CARPENTER TECHNOLOGY CORPORATION, 1735 MARKET STREET, 15TH FL		 3. Date of Earliest Transaction (Month/Day/Year)
05/04/2018
(Street)

PHILADELPHIA, PA 19103		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 05/04/2018   M   300 A $ 43.65 11,288 D  
Common Stock 05/04/2018   M   300 A $ 17.29 11,588 D  
Common Stock 05/04/2018   M   407 A $ 33.85 11,995 D  
Common Stock 05/04/2018   S   1,007 D $ 54.9967 (1) 10,992.749 (2) D  
Common Stock               2,061.014 (3) I By 401(k) Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option $ 43.65 05/04/2018   M     100 06/30/2009 06/30/2018 Common Stock 100 (4) 0 D  
Employee Stock Option $ 43.65 05/04/2018   M     100 06/30/2010 06/30/2018 Common Stock 100 (4) 0 D  
Employee Stock Option $ 43.65 05/04/2018   M     100 06/30/2011 06/30/2018 Common Stock 100 (4) 0 D  
Employee Stock Option $ 17.29 05/04/2018   M     100 07/29/2010 07/29/2019 Common Stock 100 (4) 0 D  
Employee Stock Option $ 17.29 05/04/2018   M     100 07/29/2011 07/29/2019 Common Stock 100 (4) 0 D  
Employee Stock Option $ 17.29 05/04/2018   M     100 07/29/2012 07/29/2019 Common Stock 100 (4) 0 D  
Employee Stock Option $ 33.85 05/04/2018   M     136 08/17/2011 08/17/2020 Common Stock 136 (4) 0 D  
Employee Stock Option $ 33.85 05/04/2018   M     136 08/17/2012 08/17/2020 Common Stock 136 (4) 0 D  
Employee Stock Option $ 33.85 05/04/2018   M     135 08/17/2013 08/17/2020 Common Stock 135 (4) 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
LAIN TIMOTHY
C/O CARPENTER TECHNOLOGY CORPORATION
1735 MARKET STREET, 15TH FL
PHILADELPHIA, PA 19103		       VP-Controller, Chf Acctg Ofcr  

Signatures

 James D. Dee/POA   05/08/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The price reported is an average of the total transactions executed for the day, with the individual transactions ranging from a low of $54.98 per share to a high of $55.02 per share.
(2) Includes shares acquired under the Carpenter Technology Corporation Dividend Reinvestment Program.
(3) Includes shares acquired under the Savings Plan of Carpenter Technology Corporation. The share balance under the Savings Plan of Carpenter Technology fluctuates due to rounding differences produced by the Plan's method of estimating shares.
(4) The reporting person was granted an option to buy shares of common stock under the Carpenter Technology Corporation Stock-Based Compensation Plan for Officers and Key Employees.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.