ASTM A684 1070 Cold Rolled Steel Strip

1070 Carbon steels are those that have carbon as the specific alloying element. They contain up to 0.4% silicon and 1.2% manganese. The residual elements such as copper, molybdenum, aluminium, chromium and nickel are also present in these steels.

Dimensions and tolerances
Thickness: 0.1 to 5 mm; Tolerances: +/- 0.008 to 0.11 mm
Width: 10 to 400 mm; Tolerances: +/- 0.15 to 0.60
*accept nonstandard size, please contact with our sales.

Our Advantage
1. Precise thickness, uniform hardness. Bright surface, smooth edge.
2. High flatness of board surface, high performance after multiple bending.
3. No cracking after stamping, and the quality is stable. And we provide Self-Inspection Reports and Raw-Material Test Certificates.
4. Professional anti-rust protective packaging. On time delivery, competitive price.
5. Large stock available, no MOQ requirement

1070 Cold Rolled Steel Strip Chemical Composition

1070 Cold Rolled Steel Strip Manufacture

Condition:

1 The strip shall be furnished cold rolled spheroidized annealed, soft annealed, intermediate hardness, or full hard, as specified.

2 Intermediate hardness may be obtained by either rolling the strip after final annealing or by varying the annealing treatment, or both.

3 Pinch Pass一Spheroidized annealed and annealed material may be pinch rolled after the final anneal to improve flatness, uniformly oil, modify surface, obtain proper mechanical properties, and minimize stretcher strains if required by the purchaser.

1070 Cold Rolled Steel Strip Grain Size:

Unless otherwise specified, the steel strip shall be manufactured to a fine grain (austenitic and ferritic) practice.

Pearlite is the normal structure of cold rolled high- carbon strip unless it has had an intermediate anneal.

Hardened and Tempered Steel Strip (also known as hardened and tempered High carbon steel strip or, hardened and tempered carbon spring steel strip) is the basic raw material from which many different components are made, substantially being spring-type applications ranging from clutch plate segments to washers, retractor springs and even to tree springs in riding saddles and traditional clock springs. These strip products are a specialty of the Company and considerable plant development has taken place in recent years to facilitate a very wide range of dimensions, mechanical properties and coil weights. Hardened and Tempered Steel Strip gauges of between 0.10mm and 2.00mm can be processed and, depending on the appropriate combination to suit the process equipment, strip widths of between 4.76mm to 240mm are produced. The facilities also allow up to 2000kg coils to be produced though most are well below this, being governed by a very approximate relationship of 100kg per 25mm of width.

cold-rolled high-carbon strip in coils or cut lengths is classified as product that is 0.3000 in. [7.6 mm] or less in thickness and over 1/2 to 23 15/16 in. [12.5 to 600 mm] in width, inclusive. Strip tolerance products may be available in widths wider than 23 15/16 in. (600 mm) by agreement between purchaser and supplier; however, such products are technically classified as cold-rolled sheet. The maximum of the specified carbon range is over 0.25 to 1.35 %, inclusive.

1070 Cold Rolled Steel Strip Decarburization:

1 When specified, the steel strip shall have a maximum permissible depth of complete plus partial decarburization of 0.001 in, [0.025 mm] or 1.5 % of the thickness of the strip, whichever is greater, except that strip less than 0.011 in. [0.279 mm] thick shall show no complete decarburization.

2 Annealed is mostly a spheroidized structure, but may contain some vestiges of pearlite.

3 Spheroidized annealed is essentially free of pearlite.

4 At least one specimen shall be taken froin each lot for microexami nation. The specimens shall be prepared for microscopic examination in accordance with Guide E3.

Equivalent Materials
DIN 1.0603DIN C67AFNOR C68BS 70CSBS 70HSAISI 1070SAE 1070JIS S70C-CSPJIS S70CMJIS S70CEN 1.0603ISO CS70GOST 70UNS G10700DIN 1.1231DIN Ck67DIN C67SAFNOR C68RRAFNOR XC68AFNOR C67SBS C67SUNI C70JIS SWRH72BEN C67SEN 1.1231ISO CS65GOST 65GGOST 65GAGOST 65GB 65GB U20652GB/T 65GB/T U20652ASTM Grade 1070MIS C70DIN 1.1244DIN 70Mn4AFNOR 70Mn4BS 70Mn4JIS 70Mn4EN 1.1244ISO 70Mn4ISO B42GB/T 70MnGB/T U21702DIN 1.9613DIN SAE 1070EN 1.9613

It is furnished in the following types as specified:

1 Soft spheroidized annealed high-carbon steel is intended for applications requiring maximum cold forming. It is normally produced to give the lowest maximum Rockwell hardness for each grade.

2 Soft annealed high-carbon steel is intended for applications requiring moderate cold forming. It is produced to a maximum Rockwell hardness.

3 Intermediate hardness high-carbon steel is intended for applications where cold forming is slight or a stiff, springy product is needed, or both. It is produced to specified Rockwell hardness ranges, the maximum being higher than obtained for the annealed type.

4 Full hard high-carbon steel is intended for flat applications. It is produced to minimum Rockwell hardness requirements, which vary with grade, microstructure and gauge. Full hard can be produced with either a pearlitic or spheroidized microstructure or a mixture of both. The minimum hardness should be established between the consumer and the producer.

1070 Cold Rolled Steel Strip Finish

Surface—The strip shall be furnished with a No. 2 Regular Bright or No. 1 Matte (Dull) finish, as specified.

Oiling—The strip shall be furnished oiled or dry, as specified.

1070 Cold Rolled Steel Strip Edges

Edges—Cold-rolled carbon steel strip shall be supplied with one of the following edges as specified:

No. I—A prepared edge of a specified contour (round or square) that is produced when a very accurate width is required or when an edge condition suitable for electroplating is required, or both.

No. 2—A natural mill edge carried through the cold rolling from the hot-rolled strip without additional processing of the edge.

No. 3一An approximately square edge produced by slitting on which the burr is not eliminated. This is produced when the edge condition is not a critical requirement for the finished part. Normal coiling or piling does not provide a definite positioning of the slitting burr.

No. 4—An approximately rounded edge. This edge is produced when the width tolerance and edge condition are not as exacting as for No. 1 edges.

No. 5—An approximately square edge produced from slit edge material on which the burr is eliminated.

No. 6—An approximately square edge. This edge is produced when the width tolerance and edge condition are not as exacting as for No. I edges.

Skived Custom-shaped edges produced by mechanical edge shaving with special tooling.

1070 Cold Rolled Steel Strip Finish

Cold-rolled carbon steel strip shall be supplied with the following finishes.

1 Number 1 or Matte (Dull) 一Finish without luster, produced by rolling on rolls roughened by mechanical or chemical means. This finish is especially suitable for lacquer or paint adhesion, and is beneficial in aiding drawing operations by reducing the contact friction between the die and the strip.

2 Number 2 (Regular Bright) Finish—Finish produced by rolling on rolls having a moderately smooth finish. It is less suitable that No. 1 (matte) finish for cold forming and may be applicable for certain types of plating.

1070 Cold Rolled Steel Strip Ordering Information

Orders for material under this specification shall include the following information:

ASTM designation and date of issue.

Name, type, and steel grade number.

Hardness (if intermediate or restricted hardness is specified).

Decarburization (if required).

Application.

Dimensions.

Coil size requirements.

Edge (indicate No. 1 round, square, and so forth).

Finish (indicate and specify).

Conditions (specify whether material is oiled or dry).

Package (bare coils, skid, and so forth).

Cast or heat (formerly ladle) analysis report (if required).

1070 Cold Rolled Steel Strip Inspection and testing

a suitable frequency of verification of the dimensions of the products;

an adequate intensity of visual examination of the surface quality of the products;

an appropriate frequency and type of test to ensure that the correct grade of steel is used.

Extent of testing

Tensile and bending tests

Tolerances on shape