<PAGE>  1

                   SECURITIES AND EXCHANGE COMMISSION
                         WASHINGTON, D.C.  20549



                                FORM 8-K



                         Current Report Pursuant
                      to Section 13 or 15(d) of the
                     Securities Exchange Act of 1934



     Date of report (Date of earliest event reported)  April 16, 1998
                                                       --------------

                          LINDBERG CORPORATION
---------------------------------------------------------------------
     (Exact name of registrant as specified in its charter)


                               DELAWARE
---------------------------------------------------------------------
         (State or other jurisdiction of incorporation)


         0-8287                           36-1391480
------------------------    -----------------------------------------
(Commission File Number)    (I.R.S. Employer Identification No.)


    6133 North River Road, Suite 700, Rosemont, Illinois   60018
---------------------------------------------------------------------
   (Address of principal executive offices)         (Zip Code)


                             (847) 823-2021
---------------------------------------------------------------------
      (Registrant's telephone number, including area code)

<PAGE>  2

Item 2.   Acquisition or Disposition of Assets

     On April 16, 1998  the registrant purchased  all of the  outstanding
shares of capital  stock of Houston  Heat Treating Company  from its  ten
individual shareholders for  $11,500,000 in cash.  Houston Heat  Treating
Company is a  Texas corporation engaged  in the  heat treating  business.
The registrant intends to use the  assets of the acquired company in  the
same manner as they were used before the acquisition, except as described
in the last sentence.  The stock purchase price  was  negotiated  between
the registrant  and representatives of  the sellers and was financed from
a revolving line of credit under an amended bank  credit  agreement  with
the registrant's banks.  Cash in the amount of $800,000  was  transferred
from  the  acquired  company  upon  closing  of  the  transaction  to the
registrant to pay down the borrowing under the revolving line  of credit.
                                     -2-

<PAGE>  3

                                SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf  by
the undersigned hereunto duly authorized.


                                LINDBERG CORPORATION


Date  April 23, 1998          By:    /s/ Stephen S. Penley
                                   -----------------------
                                   Stephen S. Penley
                                   Senior Vice President,
                                   Chief Financial Officer
                                   and Secretary
                                     
                                     -3-

<PAGE>  4
                                  Exhibit Index

<TABLE>
<CAPTION>

Exhibit No.                       Description
-----------                       -----------
       <S>        <C>
       2.1        Agreement for Purchase and Sale of Stock dated
                  as of April 16, 1998 among Lindberg
                  Corporation and the stockholders of Houston
                  Heat Treating Company

</TABLE>
                                     -4-
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{"company-data": {"conformed-name": "LINDBERG CORP /DE/", "cik": "0000059593", "assigned-sic": "3390", "irs-number": "361391480", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-08287", "film-number": "98599875"}, "business-address": {"street1": "6133 N RIVER RD STE 700", "city": "ROSEMONT", "state": "IL", "zip": "60018", "phone": "7088232021"}, "mail-address": {"street1": "6133 N RIVER ROAD SUITE 700", "street2": "6133 N RIVER ROAD SUITE 700", "city": "ROSEMONT", "state": "IL", "zip": "60018"}}
1

                   SECURITIES AND EXCHANGE COMMISSION
                         WASHINGTON, D.C.  20549

                                FORM 8-K

                         Current Report Pursuant
                      to Section 13 or 15(d) of the
                     Securities Exchange Act of 1934

     Date of report (Date of earliest event reported)  April 16, 1998
                                                       --------------

                          LINDBERG CORPORATION
---------------------------------------------------------------------
     (Exact name of registrant as specified in its charter)

                               DELAWARE
---------------------------------------------------------------------
         (State or other jurisdiction of incorporation)

         0-8287                           36-1391480
------------------------    -----------------------------------------
(Commission File Number)    (I.R.S. Employer Identification No.)

    6133 North River Road, Suite 700, Rosemont, Illinois   60018
---------------------------------------------------------------------
   (Address of principal executive offices)         (Zip Code)

                             (847) 823-2021
---------------------------------------------------------------------
      (Registrant's telephone number, including area code)
2

Item 2.   Acquisition or Disposition of Assets

     On April 16, 1998  the registrant purchased  all of the  outstanding
shares of capital  stock of Houston  Heat Treating Company  from its  ten
individual shareholders for  $11,500,000 in cash.  Houston Heat  Treating
Company is a  Texas corporation engaged  in the  heat treating  business.
The registrant intends to use the  assets of the acquired company in  the
same manner as they were used before the acquisition, except as described
in the last sentence.  The stock purchase price  was  negotiated  between
the registrant  and representatives of  the sellers and was financed from
a revolving line of credit under an amended bank  credit  agreement  with
the registrant's banks.  Cash in the amount of $800,000  was  transferred
from  the  acquired  company  upon  closing  of  the  transaction  to the
registrant to pay down the borrowing under the revolving line  of credit.
                                     -2-
3

                                SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf  by
the undersigned hereunto duly authorized.

                                LINDBERG CORPORATION

Date  April 23, 1998          By:    /s/ Stephen S. Penley
                                   -----------------------
                                   Stephen S. Penley
                                   Senior Vice President,
                                   Chief Financial Officer
                                   and Secretary
                                     
                                     -3-
4
                                  Exhibit Index
Exhibit No.                       Description
-----------                       -----------
2.1        Agreement for Purchase and Sale of Stock dated
                  as of April 16, 1998 among Lindberg
                  Corporation and the stockholders of Houston
                  Heat Treating Company
-4-