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ASTM A 278 - Standard for Pressure Casting Parts

This specification covers gray iron for castings suitable for pressure-containing parts for use at temperatures up to 650°F (350°C).

Classes of Iron:

1. Castings of all classes are suitable for use up to 450°F (230°C). For temperatures above 450°F and up to 650°F, only Class 40, 45, 50, 55, and 60 castings are suitable.

2. Castings of all classes are suitable for use up to 230°C. For temperatures above 230°C and up to 350°C, only Class 275, 300, 325, 350, 380, and 415 castings are suitable.

Heat Treatment:

1. Whether or not heat treatment is required for Class 40, 45, 50, 55, and 60 castings to be used at temperatures at 450°F or less.

2. Whether or not heat treatment is required for Class 275, 300, 325, 350, 380, and 415 castings to be used at temperatures at 230°C or less.

Tensile Requirements
Class of Iron Tensile Strength, min, MPa
No. 20 20
No. 25 25
No. 30 30
No. 35 35
No. 40 40
No. 45 45
No. 50 50
No. 55 55
No. 60 60
No. 150 150
No. 175 175
No. 200 200
No. 225 225
No. 250 250
No. 275 275
No. 300 300
No. 325 325
No. 350 350
No. 380 380
No. 415 415
Chemical Composition

1. Class 40, 45, 50, 55, and 60 castings intended for service above 450°F (230°C) shall have a maximum carbon equivalent of 3.8 % as calculated from the equation CE = %C + 0.3 (%Si + %P). The maximum phosphorus and sulfur contents shall be 0.25 % and 0.12 %, respectively.

2. Class 275, 300, 325, 350, 380, and 415 castings intended for service above 230°C shall have a maximum carbon equivalent of 3.8 % as calculated from the equation CE = %C + 0.3 (%Si + %P). The maximum phosphorus and sulfur contents shall be 0.25 % and 0.12 %, respectively.

3. The chemical analysis for total carbon shall be made on either chilled cast pencil-type specimens or thin wafers approximately 1⁄32 in. thick cut from test coupons. Drillings shall not be used because of attendant loss of graphite.

Workmanship, Finish, and Appearance

1. All castings shall be made in a workmanlike manner and shall conform to the dimensions on drawings furnished by the purchaser. If the pattern is supplied by the purchaser without drawings, the dimensions of the casting shall be as predicted by the pattern.

2. The surface of the casting shall be free of adhering sand, scale, cracks, and hot tears as determined by visual examination. Other surface discontinuities shall meet the visual acceptance standards specified in the order.

Source: iron-foundry.com

Specification for ASTM A439 Austenitic Ductile Iron type D2B

This specification covers austenitic ductile iron castings, which are used primarily for their resistance to heat, corrosion, and wear, and for other special purposes.

International Specifications Equivalent to ASTM A439 D2B
BS3468:1986 S2B
UK
BS3468:1974 ; ISO2892:1973
S- NiCr 20 3
France
NFA32- 301
S- NC 20 3
Germany
DIN1694
GGG- NiCr203
USA
ASTMA436; ASTMA439
A439 Type D2B


Mechanical Properties Metric English
Hardness, Brinell  148 - 211 148 - 211
Hardness, Knoop  200 200
Hardness, Vickers  188 188
Tensile Strength, Ultimate  <= 400 MPa <= 58000 psi
Tensile Strength, Yield  <= 210 MPa <= 30500 psi
Elongation at Break  <= 7.0 % <= 7.0 %


Component Elements Properties Metric English
Carbon, C  <= 3.0 % <= 3.0 %
Chromium, Cr  2.75 - 4.0 % 2.75 - 4.0 %
Iron, Fe  66.67 - 73.97 % 66.67 - 73.97 %
Manganese, Mn  0.70 - 1.25 % 0.70 - 1.25 %
Nickel, Ni  18 - 22 % 18 - 22 %
Phosphorous, P  <;= 0.080 % <= 0.080 %
Silicon, Si  1.5 - 3.0 % 1.5 - 3.0 %

To see complete data sheet for this material, click here

ASTM A335 P11 Alloy Pipe Specification

ASTM A335 P11 is the part of ASTM A335, The pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding.
The steel material shall conform to chemical composition, tensile property, and hardness requirements.

Each length of pipe shall be subjected to the hydrostatic test. Also, each pipe shall be examined by a non-destructive examination method in accordance to the required practices.
The different mechanical test requirements for pipes, namely, transverse or longitudinal tension test, flattening test, and hardness or bend test are presented.Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.


ASTM A335 P11 Chemical Compositions(%) 

Carbon                   0.05-0.15
Manganese             0.30-0.60
Phosphorus(max.)  0.025
Sulfur(max.)          0.025
Silicon                   0.50-1.00
Chromium             1.00-1.50
Molybdenum         0.44-0.65

Mechanical Properties  of ASTM A335 P11

Tensile strength, min, (MPa) 415
Yield strength, min, (MPa) 205
Elongation, min, (%), L/T 30/20

Material &Manufacture

Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below.

Heat Treatment

  • A / N+T
  • N+T / Q+T
  • N+T

Mechanical Tests Specified

  • Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test
  • For material heat treated in a batch-type furnace, tests shall be made on 5% of the pipe from each treated lot. For small lots, at least one pipe shall be tested.
  • For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipe.

Notes for Hardness Test:

  • P11 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].

Notes for Bend Test:

  • For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test.
  • Other pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser.
  • The bend test specimens shall be bent at room temperature through 180 without cracking on the outside of the bent portion.
Source: Sunny steel

Alloy Steel AISI 4142

Introduction

AISI 4142 is a Standard grade Alloy Steel. It is commonly called AISI 4142 Chromium-molybdenum steel. It is composed of (in weight percentage) 0.40-0.45% Carbon (C), 0.75-1.00% Manganese (Mn), 0.035%(max) Phosphorus (P), 0.04%(max) Sulfur (S), 0.15-0.30% Silicon (Si), 0.80-1.10% Chromium (Cr), 0.15-0.25% Molybdenum (Mo), and the base metal Iron (Fe). Other designations of AISI 4142 alloy steel include UNS G41420 and AISI 4142.

Equivalent materials to AISI 4142 alloy steel are:
  • ASTM A322
  • ASTM A331
  • ASTM A505
  • ASTM A519
  • ASTM A547
  • SAE J404
  • SAE J412
  • SAE J770
  • ASTM A29
  • ASTM A372 (VIII)
  • ASTM A711
  • ASTM A752
  • ASTM A829
  • SAE J1397
 Chemical Composition
The following table shows the chemical composition of AISI 4142 alloy steel.
Element Content (%)
Iron, Fe ≥ 96.725
Chromium, Cr 0.80-1.10
Manganese, Mn 0.75-1.10
Carbon, C 0.40-0.45
Silicon, Si 0.15-0.30
Molybdenum, Mo 0.15-0.25
Sulfur, S ≤ 0.040
Phosphorous, P ≤ 0.035

Physical Properties

The physical properties of AISI 4142 alloy steel are outlined in the following table.
Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³

Mechanical Properties

The mechanical properties of AISI 4142 alloy steel are highlighted below.
Properties Metric Imperial
Elastic modulus 190-210 GPa 27557-30458 ksi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Hardness, Brinell (annealed and cold drawn) 187-229 187-229
Hardness, Knoop (converted from Brinell hardness) 230 230
Hardness, Rockwell B (converted from Brinell hardness) 94 94
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) 15 15
Hardness, Vickers (converted from Brinell hardness) 218 218
Machinability (annealed and cold drawn, based AISI 1212 steel, as on 100 machinability) 65 65

Thermal Properties

The thermal properties of AISI 4142 alloy steel are outlined below.
Properties Metric Imperial
Thermal conductivity 42.6 W/mK 296 BTU in/hr.ft².°F


Source: azom and efunda

Properties of Mould Stainless Steel SCS13


Chemical composition % 

C
Si
Mn
P
S
Cr Ni
 0.08 2.0  2.0 0.04  0.04  18-21(23) 8-11

Properties of grade SCS13
salt-bath furnace controlled atmosphere furnace
235 262 788 1191 1204 5~15 air cooling 522 60
longitudinal horizontal
Hot-rolled/Cold rolling:5 - 150 520 415 16~18 2a 3.5a

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