Exhibit 3.312

Form BCA-2.10

ARTICLES OF INCORPORATION

(Rev. Jan 1995)

George H. Ryan

Secretary of State

Department of Business Services

Springfield, IL 62756

Payment must be made by certified check, cashier’s check, Illinois attomey’s check Illinois C.P.A’s check or money order, payable to “secretary of States.

This space for use by Secretary of State

FILED

NOV 19 1998

GEORGE H. RYAN

SECRETARY OF STATE

SUBMIT IN DUPLICATE !

This space for use by

Secretary of State

Date 11-19-[ILLEGIBLE]

Franchise Tax $25.00

Filing Fee $75.00

Approved: [ILLEGIBLE]

1. CORPORATE NAME: OHS of Hartgrove, Inc.

(The corporate name must contain the word “corporation’, “company,” incorporated,” “limited” or an abbreviation thereof.)

2. Initial Registered Agent: C T CORPORATION SYSTEM

Initial Registered Office: First Name Middle Initial Last Name

C/O C T CORPORATION SYSTEM, 208 S. La Salle Street.

Number Street Suite#

Chicago, IL 60604 Cook

City ZipCode County

3. Purpose or purposes for which the corporation is organized:

(If not sufficient space to cover this point, add one or more sheets of this size.)

Own and operate a behavioral health facility.

4. Paragraph 1: Authorized Shares, Issued Shares and Consideration Received:

Class Common

Par Value per Share

Number of Shares Authorized

Number of Shares Proposed to be issued

Consideration to be Received Therefor

$1.00 1,000 200 $200.00

TOTAL= $ 200.00

Paragraph 2: The preferences, qualifications, limitations, restrictions and special or relative rights in respect

the shares of each class are:

(If not sufficient space to cover this point, add one or more sheets of this size.)

None

602 l—990—7

(ILL. — 548 — 12/27/94) [ILLEGIBLE]

(over)

EXPEDITE

NOV 1 9 1998

SECRETARY OF STATE

5. OPTIONAL:

(a) Number of directors constituting the Initial board of directors of the corporation: 3.

(b) Names and addresses of the persons who are to serve as directors until the first annual meeting of shareholders or until their successors are elected and qualify:

Name Residential Address City, State, ZIP

Alan B. Miller 57 Crosby Brown Road, Gladwyne, PA 19035

Kirk E. Gorman 1566 Hancock Lane, Wayne, PA 19087

Thomas J. Bender 407 Rock Creek Circle, Berwyn, PA 19312

6. OPTIONAL:

(a) It is estimated that the value of all property to be owned by the corporation for the following year wherever located will be: $            

(b) It is estimated that the value of the property to be located within the State of Illinois during the following year wilt be: $            

(c) It is estimated that the gross amount or business that will be transacted by the corporation during the following year will be: $            

(d) It is estimated that the gross amount of business that will be transacted from places of business in the State of Illinois during the following year will be: $            

7.OPTIONAL: OTHER PROVISIONS

Attach a separate sheet of this size for any other provision to be included in the Articles of

Incorporation , e.g., authorizing preemptive rights, denying cumulative voting, regulating internal affairs, voting majority requirements, fixing a duration other than perpetual, etc.

8. NAME(S) & ADDRESS(ES) OF INCORPORATOR(S)

The undersigned Incorporator(s) hereby declare(s), under penalties of perjury, that the statements made in the foregoing Articles of Incorporation are true.

Dated November ,17 1998.

Signature and Name Address

1.

Signature 1. Street

Bruce R. Gilbert

(Type or Print Name) City/Town State Zip Code

2. 2.

Signature Street

Sherrie L. Hedrick

(Type or Print Name) City/Town State Zip Code

3. 3.

Signature Street

(Type or Print Name) City/Town State Zip Code

(Signatures must be in BLACK INK on original document. Carbon copy, photocopy or rubber stamp signatures may only [ILLEGIBLE] used on conformed copies.)

NOTE: If a corporation acts as incorporator, the name of the corporation and the state of incorporation shall be shown and [ILLEGIBLE] execution shall be by Its president or vice president and verified by him, and attested by Its secretary or assistant secretary.

FEE SCHEDULE

• The initial franchise tax is assessed at the rate of 15/100 of 1 percent ($1.50 per $1,000) on the paid-in capital represented in this state, with a minimum of $25.

• The filing fee is $75.

• The minimum total due (franchise tax + filing fee) is $100.

(Applies when the Consideration to be Received as set forth in Item 4 does not exceed $16,667)

• The Department of Business Services In Springfield will provide assistance in calculating the total fees if necessary.

Illinois Secretary of State Springfield, IL 62756

Department of Business Services Telephone (217) 782-9522 or 782-9523